(l) a report of an interdepartmental committee task force within a public authority, which has been established for the purpose of preparing a report on a particular topic, unless the report is to be submitted to Cabinet or a committee or subcommittee of Cabinet; (m) a report of a committee, council or other body which is attached to a public authority and which has been established for the purpose of undertaking inquiries and making reports and recommendations to the public authority; (n) the reasons for a final decision, order or ruling of a public authority made during or at the conclusion of the exercise of discretionary power conferred by or under a written law or scheme administered by the public authority, whether or not the written law or scheme allows an appeal to be taken against the decision, order or ruling, and whether or not the reasons (i) are contained in an internal memorandum of the public authority or in a letter from an officer or employee of the public authority, or (ii) were given by the officer who made the decision, order or ruling or were incorporated by reference into the decision, order or ruling. (3) Where a decision is made under Part II that an applicant is not entitled to access to a document by reason of the application of this section, the notice under section 19 shall state the public interest considerations on which the decision is based. (4) Subsection (1) shall cease to apply to a document brought into existence on or after the commencement of this Act when a period of 10 years has elapsed since the last day of the year in which the document came into existence. National security and defence documents 27. (1) A document is an exempt document if disclosure of the document under this Act would be contrary to the public interest for the reason that the disclosure would prejudice the security or defence of Botswana. 23