43In that respect, it is settled case-law that if the judicial review guaranteed by Article 47 of the Charter is to be effective, the person concerned must be able to ascertain the reasons upon which the decision taken in relation to him or her is based, either by reading the decision itself or by requesting and obtaining notification of those reasons, without prejudice to the power of the court with jurisdiction to require the authority concerned to provide that information, so as to make it possible for him or her to defend his or her rights in the best possible conditions and to decide, with full knowledge of the relevant facts, whether there is any point in applying to the court with jurisdiction, and in order to put the latter fully in a position in which it may carry out the review of the lawfulness of the national decision in question (see, to that effect, judgments of 15 October 1987, Heylens and Others, 222/86, EU:C:1987:442, paragraph 15, and of 4 June 2013, ZZ, C‑300/11, EU:C:2013:363, paragraph 53).
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