Any motion to enter judgment for support arrearages pursuant to § 16.1-278.18 must be served upon the respondent in accordance with the provisions of §§ 8.01-296, 8.01-327, 8.01- 329, or by (1) certified mail, return receipt requested, and (2) first class mail. Upon sufficient showing that a diligent effort was made to ascertain the location of a party, that party may be served with any required notice by delivery of the written notice to that party’s residential or business address as filed with the court pursuant to Code § 20-60.3 or the Department of Social Services, or if changed, as shown in the records of the Department of Social Services.