. "e a notice or other document is to be served on a person for the purposes of this Act, it may be served???(a) by delivering it personally to the person; or(b) by delivering it at the usual or last known place of residence or business of the person, including by facsimile; or(c) by sending it by pre-paid post addressed to the person at the usual or last known place of residence or business of the p" . . .