(1) to examine any books, papers, records, or other data which may be relevant or material to such inquiry;
(2) to summon the person liable for tax or required to perform the act, or any officer or employee of such person, or any person having possession, custody, or care of books of account containing entries relating to the business of the person liable for tax or required to perform the act, or any other person the Director may deem proper, to appear before the Director at a time and place named in the summons and to produce such books, papers, records, or other data, and to give such testimony, under oath, as may be relevant or material to such inquiry; and
(3) to take such testimony of the person concerned, under oath, as may be relevant or material to such inquiry.