(a) a trustee, transfer agent or other agent to maintain the central securities register and the register of transfers and one or more persons or agents to maintain the branch securities registers,

(b) a registrar, trustee or agent to maintain a record of issued security certificates and warrants, and

(c) for the purposes of paragraphs (a) and (b), one person may be appointed in respect of all securities and warrants of the corporation or any class or classes.