(2) Subject to subsection (3) and to section 13, where the applicant has requested access by a particular method, access shall be given by that method. (3) Access by a particular method requested by an applicant under subsection (2) may be refused, and shall given by another method, where the method of access requested - Deferral of access (a) would interfere unreasonably with the operations of the public authority; (b) would be detrimental to the preservation of the document; (c) having regard to the physical nature of the document, would not be appropriate; or (d) would involve an infringement of copyright, other than copyright owned by the Government, subsisting in the document. 16. (1) A public authority which receives a request for access to a document under this Act may defer the provision of access to the document until the happening of a particular event, including the taking of an action required by law or an administrative action, or until the expiration of a specified time, where it is reasonable to do so in the public interest or having regard to normal and proper administrative practices. (2) Where the provision of access to a document is deferred in accordance with subsection (1), the public authority shall, in writing, inform the applicant of the reasons for the decision and indicate the period for which the deferment will operate. Refusal of access before processing of request 17. A public authority dealing with a request may refuse to grant access to a document relating to the request, without having caused the processing of the request to have been undertaken (a) if the public authority is satisfied that the work involved in processing the request would substantially and unreasonably interfere with the normal operations of the public authority; and (b) if, before refusing to provide the document on the ground under paragraph (a), the public authority has taken reasonable steps to assist 11