Each attorney, certified public accountant, and enrolled practitioner shall exercise due diligence in:
(a) Preparing or assisting in the preparation of, approving, and filing returns, documents, affidavits, and other papers relating to Bureau matters;
(b) Determining the correctness of any representations made by him or her to the Bureau; and
(c) Determining the correctness of any information which he or she imparts to a client with reference to any matter administered by the Bureau.