(a) Unless the board agrees to accept the surrender of a license or certificate, a licensee or certificate holder may not surrender the license or certificate nor may the license or certificate lapse by operation of law while the licensee or certificate holder is under investigation or while charges are pending against the licensee or certificate holder.
(b) The board may set conditions on its agreement with the licensee or certificate holder under investigation or against whom charges are pending to accept surrender of the license or certificate.