(a) Delivery of a certificated security to a purchaser occurs when:
(1) the purchaser acquires possession of the security certificate;
(2) another person, other than a securities intermediary, either acquires possession of the security certificate on behalf of the purchaser or, having previously acquired possession of the certificate, acknowledges that it holds for the purchaser; or
(3) a securities intermediary acting on behalf of the purchaser acquires possession of the security certificate, only if the certificate is in registered form and is (i) registered in the name of the purchaser, (ii) payable to the order of the purchaser, or (iii) specially indorsed to the purchaser by an effective indorsement and has not been indorsed to the securities intermediary or in blank.