(b) By parties. All motions, petitions, pleadings, briefs, or other documents shall be filed with the Office of Administrative Law Judges with a copy, including any attachments, to all other parties of record. When a party is represented by an attorney, service shall be made upon the attorney. Service of any document upon any party may be made by personal delivery or by mailing by first class, prepaid U.S. mail, a copy to the last known address. The Secretary shall be served by delivery to the Associate Solicitor, Plan Benefits Security Division,
ERISA Section 3(40) Proceeding, PO Box 1914, Washington, DC 20013. The person serving the document shall certify to the manner and date of service.