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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ifrs-full_Assets_d8c6d5d9-7752-48a2-873d-22381aefb413_totalLabel_fr" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Actifs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Assets" xlink:to="lab_ifrs-full_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_4f590e10-35b3-488b-9f23-990e5821531a_totalLabel_fr" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Augmentation (diminution) de la trésorerie et des équivalents de trésorerie</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:to="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_e4445291-8cc6-48b2-ac8b-1f7cb305b451_totalLabel_fr" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Passifs non courants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InflowsOfCashFromInvestingActivities_6160d1e8-52ea-4884-86e5-9171d6585220_totalLabel_fr" xlink:label="lab_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Entrées de trésorerie provenant des activités d’investissement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InflowsOfCashFromInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:to="lab_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres_label_fr" xlink:label="lab_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Impots Differes Sur Effets Des Couvertures Et Autres</link:label>
    <link:label id="lab_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres_documentation_fr" xlink:label="lab_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Impots Differes Sur Effets Des Couvertures Et Autres</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres" xlink:href="ark-2021-12-31.xsd#ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres" xlink:to="lab_ark_ImpotsDifferesSurEffetsDesCouverturesEtAutres" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_ObligationsHybridesMember_label_fr" xlink:label="lab_ark_ObligationsHybridesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Obligations Hybrides [Member]</link:label>
    <link:label id="lab_ark_ObligationsHybridesMember_documentation_fr" xlink:label="lab_ark_ObligationsHybridesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Obligations Hybrides</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_ObligationsHybridesMember" xlink:href="ark-2021-12-31.xsd#ark_ObligationsHybridesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_ObligationsHybridesMember" xlink:to="lab_ark_ObligationsHybridesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_1dbf8173-1321-4169-afaa-31751ee3e772_totalLabel_fr" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Passifs courants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_PrimesEtReserves_label_fr" xlink:label="lab_ark_PrimesEtReserves" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Primes Et Reserves</link:label>
    <link:label id="lab_ark_PrimesEtReserves_documentation_fr" xlink:label="lab_ark_PrimesEtReserves" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Primes Et Reserves</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_PrimesEtReserves" xlink:href="ark-2021-12-31.xsd#ark_PrimesEtReserves"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_PrimesEtReserves" xlink:to="lab_ark_PrimesEtReserves" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssets_f27d2032-7d19-415a-865e-f91c589d4c71_totalLabel_fr" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Actifs non courants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssets" xlink:to="lab_ifrs-full_NoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax_cf749aae-38b8-4183-aa44-d09859835485_totalLabel_fr" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres éléments du résultat global qui ne seront pas reclassés en résultat net, avant impôt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_EmissionDobligationsHybrides_label_fr" xlink:label="lab_ark_EmissionDobligationsHybrides" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Emission D'obligations Hybrides</link:label>
    <link:label id="lab_ark_EmissionDobligationsHybrides_documentation_fr" xlink:label="lab_ark_EmissionDobligationsHybrides" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Emission D'obligations Hybrides</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_EmissionDobligationsHybrides" xlink:href="ark-2021-12-31.xsd#ark_EmissionDobligationsHybrides"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_EmissionDobligationsHybrides" xlink:to="lab_ark_EmissionDobligationsHybrides" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax_cbee6c5d-9610-4f81-b763-51d09ee7b755_totalLabel_fr" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres éléments du résultat global qui seront reclassés en résultat net, avant impôt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_91ea25b5-a4f4-4b80-886b-d351a2ba5926_totalLabel_fr" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Capitaux propres attribuables aux propriétaires de la société mère</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_3a2d575d-c1af-4d86-b6b8-707b974af700_totalLabel_fr" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Profits (pertes) d’activités opérationnelles</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:to="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_RachatRemboursementDobligationsHybrides_label_fr" xlink:label="lab_ark_RachatRemboursementDobligationsHybrides" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Rachat / Remboursement D'obligations Hybrides</link:label>
    <link:label id="lab_ark_RachatRemboursementDobligationsHybrides_documentation_fr" xlink:label="lab_ark_RachatRemboursementDobligationsHybrides" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Rachat / Remboursement D'obligations Hybrides</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_RachatRemboursementDobligationsHybrides" xlink:href="ark-2021-12-31.xsd#ark_RachatRemboursementDobligationsHybrides"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_RachatRemboursementDobligationsHybrides" xlink:to="lab_ark_RachatRemboursementDobligationsHybrides" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_IncidenceVariationsChangeEtPerimetre_label_fr" xlink:label="lab_ark_IncidenceVariationsChangeEtPerimetre" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Incidence Variations Change Et Perimetre</link:label>
    <link:label id="lab_ark_IncidenceVariationsChangeEtPerimetre_documentation_fr" xlink:label="lab_ark_IncidenceVariationsChangeEtPerimetre" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Incidence Variations Change Et Perimetre</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_IncidenceVariationsChangeEtPerimetre" xlink:href="ark-2021-12-31.xsd#ark_IncidenceVariationsChangeEtPerimetre"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_IncidenceVariationsChangeEtPerimetre" xlink:to="lab_ark_IncidenceVariationsChangeEtPerimetre" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncome_5488bb21-1305-4d28-8a3b-d31dc89eb4c6_totalLabel_fr" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Résultat global</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="lab_ifrs-full_ComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Equity_351158f0-cb4d-42a5-9f33-83d21b8b4d80_totalLabel_fr" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Capitaux propres</link:label>
    <link:label id="lab_ifrs-full_Equity_031d57a4-6ea9-47ce-9d8a-5a0c1485b340_periodStartLabel_fr" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Capitaux propres en début de période</link:label>
    <link:label id="lab_ifrs-full_Equity_368e4875-845e-47ad-9211-d477bad39bf2_periodEndLabel_fr" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Capitaux propres en fin de période</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Equity" xlink:to="lab_ifrs-full_Equity" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee_label_fr" xlink:label="lab_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Remuneration Versee Aux Porteurs De Titres Subordonnes A Duree Indeterminee</link:label>
    <link:label id="lab_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee_documentation_fr" xlink:label="lab_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Remuneration Versee Aux Porteurs De Titres Subordonnes A Duree Indeterminee</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee" xlink:href="ark-2021-12-31.xsd#ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee" xlink:to="lab_ark_RemunerationVerseeAuxPorteursDeTitresSubordonnesADureeIndeterminee" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_VariationDesFournisseursDimmobilisations_label_fr" xlink:label="lab_ark_VariationDesFournisseursDimmobilisations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Variation Des Fournisseurs D'immobilisations</link:label>
    <link:label id="lab_ark_VariationDesFournisseursDimmobilisations_documentation_fr" xlink:label="lab_ark_VariationDesFournisseursDimmobilisations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Variation Des Fournisseurs D'immobilisations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_VariationDesFournisseursDimmobilisations" xlink:href="ark-2021-12-31.xsd#ark_VariationDesFournisseursDimmobilisations"/>
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    <link:label id="lab_lei_LEI_f2422edc-d807-447a-9acf-adf29f7337ff_label_fr" xlink:label="lab_lei_LEI" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">LEI</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_lei_LEI" xlink:href="https://www.xbrl.org/taxonomy/int/lei/2020-07-02/lei.xsd#lei_LEI"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lei_LEI" xlink:to="lab_lei_LEI" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_AutresProvisionsEtImpotsDifferes_label_fr" xlink:label="lab_ark_AutresProvisionsEtImpotsDifferes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres Provisions Et Impots Differes</link:label>
    <link:label id="lab_ark_AutresProvisionsEtImpotsDifferes_documentation_fr" xlink:label="lab_ark_AutresProvisionsEtImpotsDifferes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres Provisions Et Impots Differes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_AutresProvisionsEtImpotsDifferes" xlink:href="ark-2021-12-31.xsd#ark_AutresProvisionsEtImpotsDifferes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_AutresProvisionsEtImpotsDifferes" xlink:to="lab_ark_AutresProvisionsEtImpotsDifferes" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_47904f1b-6ddb-4b09-8e55-13c4fc348259_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) d’activités d’investissement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_284bde35-950a-4b2e-8bfc-1f482923aa34_totalLabel_fr" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Actifs courants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLoss_42d0d2ba-eb1d-4709-a3f1-396fd806421e_totalLabel_fr" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Résultat</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLoss" xlink:to="lab_ifrs-full_ProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_2fbd4dd0-bf42-4503-8643-158fad77419c_totalLabel_fr" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres éléments du résultat global</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncome" xlink:to="lab_ifrs-full_OtherComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_Autres_label_fr" xlink:label="lab_ark_Autres" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres</link:label>
    <link:label id="lab_ark_Autres_documentation_fr" xlink:label="lab_ark_Autres" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_Autres" xlink:href="ark-2021-12-31.xsd#ark_Autres"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_Autres" xlink:to="lab_ark_Autres" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_bfc29c10-98d6-4376-8a84-d1dcca3ad96a_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) d’activités de financement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_7b11cdaa-bee1-4449-8661-06b193d59a2c_periodStartLabel_fr" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Trésorerie et équivalents de trésorerie en début de période</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_b494eec1-5d93-49c1-9062-52fec89e4b24_periodEndLabel_fr" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Trésorerie et équivalents de trésorerie en fin de période</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalents" xlink:to="lab_ifrs-full_CashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_169f351a-5fe2-4243-8591-0be1816dac6a_totalLabel_fr" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Augmentation (diminution) par le biais de transactions avec les propriétaires, capitaux propres</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_CoutsEtChargesDexploitation_label_fr" xlink:label="lab_ark_CoutsEtChargesDexploitation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Couts Et Charges D'exploitation</link:label>
    <link:label id="lab_ark_CoutsEtChargesDexploitation_documentation_fr" xlink:label="lab_ark_CoutsEtChargesDexploitation" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Couts Et Charges D'exploitation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_CoutsEtChargesDexploitation" xlink:href="ark-2021-12-31.xsd#ark_CoutsEtChargesDexploitation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_CoutsEtChargesDexploitation" xlink:to="lab_ark_CoutsEtChargesDexploitation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OutflowsOfCashFromInvestingActivities_d10e14c6-9537-4c46-acf4-f02337138e12_totalLabel_fr" xlink:label="lab_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Sorties de trésorerie provenant des activités d’investissement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OutflowsOfCashFromInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:to="lab_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_AutresProvisionsEtAutresPassifsNonCourants_label_fr" xlink:label="lab_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres Provisions Et Autres Passifs Non Courants</link:label>
    <link:label id="lab_ark_AutresProvisionsEtAutresPassifsNonCourants_documentation_fr" xlink:label="lab_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Autres Provisions Et Autres Passifs Non Courants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:href="ark-2021-12-31.xsd#ark_AutresProvisionsEtAutresPassifsNonCourants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:to="lab_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_InvestissementsIncorporelsEtCorporels_label_fr" xlink:label="lab_ark_InvestissementsIncorporelsEtCorporels" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Investissements Incorporels Et Corporels</link:label>
    <link:label id="lab_ark_InvestissementsIncorporelsEtCorporels_documentation_fr" xlink:label="lab_ark_InvestissementsIncorporelsEtCorporels" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Investissements Incorporels Et Corporels</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_InvestissementsIncorporelsEtCorporels" xlink:href="ark-2021-12-31.xsd#ark_InvestissementsIncorporelsEtCorporels"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_InvestissementsIncorporelsEtCorporels" xlink:to="lab_ark_InvestissementsIncorporelsEtCorporels" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember_label_fr" xlink:label="lab_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Resultats Non Distribues Et Autres Elements Du Resultat Global Accumules [Member]</link:label>
    <link:label id="lab_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember_documentation_fr" xlink:label="lab_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Resultats Non Distribues Et Autres Elements Du Resultat Global Accumules</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember" xlink:href="ark-2021-12-31.xsd#ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember" xlink:to="lab_ark_ResultatsNonDistribuesEtAutresElementsDuResultatGlobalAccumulesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_3e07c07d-891f-423d-9b24-c7955354516a_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) des activités opérationnelles</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_e6ceaaef-a5c7-40cd-8516-1eb4645fac3a_totalLabel_fr" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="fr">Capitaux propres et passifs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
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