78It follows from the case-law of the Court that the effectiveness of the judicial review guaranteed by Article 47 of the Charter also requires that the person concerned be able to ascertain the reasons upon which the decision taken by an administrative authority in relation to him is based, either by reading the decision itself or by communication of those reasons on its request, without prejudice to the power of the court having jurisdiction to require the authority concerned to communicate them so as to enable him to defend his rights in the best possible conditions and to decide in full knowledge of the circumstances whether it is worthwhile applying to the court having jurisdiction, and in order to put the latter fully in a position to carry out the review of the lawfulness of the national decision in question (judgments of 4 June 2013, ZZ, C‑300/11, EU:C:2013:363, paragraph 53, and of 16 May 2017, Berlioz Investment Fund, C‑682/15, EU:C:2017:373, paragraph 84).
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