The Director may, by notice in writing, require—
(a)
any person whose affairs are being investigated; or
(b)
any other person who the Director has reason to believe may have information or documents relevant to an investigation,—
at the time and place specified in the notice, to do any 1 or more of the following things:
(c)
to attend before the Director:
(d)
to answer questions with respect to any matter that the Director has reason to believe may be relevant to the investigation:
(e)
to supply any information specified in the notice with respect to any matter that the Director has reason to believe may be relevant to the investigation:
(f)
to produce for inspection any documents which are specified in the notice and which the Director has reason to believe may be relevant to the investigation.