The Bank may - ( a ) by notice in writing served on an authorised institution require it to produce, within such time and at such place as may be specified in the notice, such document or documents of such description as may be so specified; ( b ) authorise an officer, servant or agent of the Bank, on producing evidence of his authority, to require any such institution to provide him forthwith with such information, or to produce to him forthwith such documents, as he may specify, being such information or documents as the Bank may reasonably require for the performance of its functions under this Act.