(a) Copies of all pleadings, motions, and documents filed with the Hearing Docket must be served upon all parties to the proceedings by the person filing them.

(b) Service may be made by personal delivery or by mail.

(c) A certificate of service shall accompany all documents when they are tendered for filing and shall consist of a certificate of personal delivery or a certificate of mailing, executed by the person making the personal delivery or mailing the document.

(d) Whenever proof of service by mail is made, the date of mailing or the date as shown on the postmark shall be the date of service, and where personal service is made, the date of personal delivery shall be the date of service.