13   Exercise of functions through subsidiary corporations, joint ventures etc

(1)  In this section, private subsidiary corporation means a private subsidiary corporation referred to in section 23.

(2)  Any function of the Authority may be exercised:

(a)  by the Authority itself, or

(b)  by a private subsidiary corporation, or

(c)  by the Authority or a private subsidiary corporation, or both, in a partnership, joint venture or other association with public or local authorities or other persons or bodies.