46Accordingly, first, where the contracting authority undertakes to verify during the contract award procedure, as it is obliged to do under Article 56(1)(b) of Directive 2014/24, read in the light of recital 40 of that directive, whether there are exclusion grounds within the meaning of Article 57(4)(a) of that directive and the national rules provide that it has the option, or even the obligation, to exclude the economic operator on the grounds that a subcontractor has failed to comply with obligations relating to environmental, social and labour law, it is required, in order to comply with the principle of equal treatment, to verify whether there is any failure to comply with those obligations in respect not only of all the economic operators who have submitted a tender, but also in respect of all the subcontractors indicated by those operators in their respective tenders.
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