A reference in this Act to
(a) writing includes any mode of presenting or reproducing letters, figures or marks in a visible form, and
(b) a security being deposited or required to be deposited with a central securities depository shall be construed as a reference to a deposit of
(i) the certificate,
(ii) the instrument of transfer, if any, or
(iii) any other document representing the security, to the central securities depository.