A subpoena shall be served by delivering a copy of the subpoena to the individual named on the subpoena or to any person who would be eligible to receive service of summons (5-07/500.00 Service of Summons) on behalf of the individual or organization named on the subpoena. The copy of the subpoena may be delivered by personal service (CCP 415.10), by substituted service (CCP 415.20), or by certified mail. The affidavit of the individual serving the subpoena setting forth the manner of such service, along with the return post office receipt in the case of mail service, shall be sufficient proof of such service. (GC 12963.1)