4.—(1) A notice under section 8 or section 17 shall be addressed to the person concerned by name, and may be served on or given to the person 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; or

(c) by sending it by post in a prepaid 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 1963 to 2003 shall be deemed to be ordinarily resident at its registered office, and every other body corporate and every unincorporated body shall be deemed to be ordinarily resident at its principal office or place of business.