24It is therefore, according to the case-law, for the institution which has refused access to a document to provide a statement of reasons from which it is possible to understand and ascertain, first, whether the document requested does in fact fall within the sphere covered by the exception relied on and, secondly, whether the need for protection relating to that exception is genuine (see judgment of 4 May 2012, In ‘t Veld v Council, T‑529/09, EU:T:2012:215, paragraph 118 and the case-law cited).