88In any event, the discretion conferred on the Member States must not be used by them in a manner which would undermine the objective of that directive and the effectiveness thereof or which would infringe the principle of proportionality (see, to that effect, judgment of 9 July 2015, K and A, C‑153/14, EU:C:2015:453, paragraphs 50 and 51 and the case-law cited).
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