(a) state the findings on any material question of fact, referring to the material on which those findings were based, and the reasons for the decision; (b) where the decision relates to a public authority, state the name and designation of the person giving the decision; (c) where the decision does not relate to a request for access to a document which if it existed, would be an exempt document but access is given to a document in accordance with section 13, state that the document is a copy of a document from which exempt information has been deleted; (d) where the decision is to the effect that the document does not exist, state that a thorough and diligent search was made to locate the document; and (e) inform the applicant of the right to apply to court for a review of the decision in accordance with section 42. (2) A public authority shall not be required to include, in a notice under subsection (1), any matter that is of such a nature that its inclusion in a document would cause that document to be an exempt document. Decisions to be made by authorised persons 20. A decision in respect of a request made to a public authority may be made, on behalf of the public authority, by (a) the responsible Minister; (b) the chief executive officer of the public authority; or (c) an officer of the public authority acting within the scope of authority exercisable by the officer in accordance with any arrangements approved by the responsible Minister or the chief executive officer of the public authority. 13