Where proof of service is required by statute or rule, filing the papers with the board, together with one of the following, shall constitute proof of service:

(1) an acknowledgement of service

(2) A certificate that the person signing the certificate served the papers upon all parties of record in the proceeding by delivering a copy thereof in person to (names).

(3) A certificate that the person signing the certificate served the papers upon all parties of the proceeding by:

(a) Mailing a copy thereof, properly addressed with the postage prepaid, to each party to the proceeding or his or her attorney or authorized agent; or

(b) Transmitting a copy thereof by fax, and on the same day mailing a copy, to each party to the proceeding or his or her attorney or authorized agent; or

(c) Depositing a copy thereof, properly addressed with charges prepaid, with a commercial parcel delivery company.