If 2 or more persons have been appointed as controllers of property of a corporation:
(a) a function or power of a controller of property of the corporation may be performed or exercised by any one of them, or by any 2 or more of them together, except so far as the order or instrument appointing them otherwise provides; and
(b) a reference in this Act to a controller, or to the controller, of property of a corporation is, in the case of the first - mentioned corporation, a reference to whichever one or more of those controllers the case requires.