(A) All witnesses at any hearing before the board shall testify under oath or affirmation.
(B) A witness may be accompanied and advised by legal counsel. Participation by counsel is limited to protection of his client's rights. Counsel for a non-party witness may neither examine nor cross-examine any witness.
(C) Should a witness refuse to answer a question ruled proper at a hearing or disobey a subpoena, the board may initiate contempt proceedings.