Each Institution shall forward to the Court of Auditors every three months and at the latest within the month which follows the end of the quarter, and, in the case of the fourth quarter, at the latest within the month which follows the close of the financial year, the documents supporting the accounts, in particular the documents and certificates in respect of the correct application of the provisions which govern the implementation of the budget and relating to commitments and payments, to the establishment and collection of revenue, subject to Article 19 of Council Regulation (EEC, Euratom, ECSC) No 2891/77 and to Article 80 of this Financial Regulation. The Court of Auditors may question each Institution on the subject of the said supporting documents.