A person appearing as a witness at an inquiry by a commission shall not, without reasonable excuse—
(a) refuse or fail to be sworn or to make an affirmation; or
(b) refuse or fail to answer a question that the person is required to answer by the commissioner conducting or presiding at the inquiry; or
(c) refuse or fail to produce a document that the person was required to produce by a summons under this Act served on the person.
Penalty—Maximum penalty—20 penalty units or imprisonment for 6 months.