1. After filing the accusation, the Executive Secretary of the Board shall cause a copy thereof, together with one copy of the Statement to Respondent and three copies of the form of the Notice of Defense, to be served on the respondent.
2. Service may be by personal service or by first-class registered or certified mail addressed to the respondent at his or her last address of record, or by mail to his or her attorney of record. Proof of service must be retained and made a part of the case record.