Every person -
(a) shall upon demand assist to the best of his ability any officer or other person or court in the exercise of any of the powers conferred by subsection (1);
(b) summoned under paragraph (iii) of subsection (1) whose reasonable expenses have been paid or offered
to him shall attend at the time and place specified, and remain in attendance until excused by the officer or other person or court from further attendance;
(c) shall take the oath administered to him by any officer or other person or court under paragraph (iv) of subsection (1);
(d) shall answer fully and satisfactorily, to the best of his ability, all questions lawfully put to him by any officer or other person or court under paragraph (i) or (iv) of subsection (1), and, upon being required to do so, produce any book, document or thing in his possession or under his control: Provided that in connection with the interrogation of any such person by, or the production of any such book, document or thing to any such officer or other person or court, the law relating to privilege, as applicable to a witness summoned to give evidence or produce any book, document or thing before a court of law shall apply; and
(e) upon being required to do so, shall subscribe to a declaration of the truth of any statement made by him.