Banks Also Serves as "Registrar" for Stocks and Bond Issues

Banks also serves as "registrar" for stocks and bond issues. The registrar accounts for all shares issued, certificates outstanding, and Certificates cancelled. The role/s of the registrar is/are:

A) To ensure that the transfer agent does not issue too many shares
B) That old certificates are properly cancelled
C) That new certificates are properly issued in the correct numerical sequence
D) All of these