4. (1) A notice that is required to be served on a person under this Act shall be addressed to the person by name and may be so served in one of the following ways:

(a) by delivering it to the person;

(b) by leaving it at the address at which the person ordinarily resides or, in a case in which an address for service has been furnished, at that address;

(c) by sending it by post in a pre-paid registered letter to the address at which the person ordinarily resides or, in a case in which an address for service has been furnished, to that address.

(2) For the purposes of this section, a company within the meaning of the Companies Acts shall be deemed to be ordinarily resident at its registered office, and every other body corporate and every unincorporated body of persons, shall be deemed to be ordinarily resident at its principal office or place of business.