5. — (1) Where a notice is required by this Act to be served on a person, it shall be addressed to him and may be served on him in some one of the following ways:

(a) where it is addressed to him by name, by delivering it to him,

(b) by leaving it at the address at which he 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 prepaid registered letter addressed to him at the address at which he ordinarily resides or, in a case in which an address for service has been furnished, at that address,

(d) where the address at which he ordinarily resides cannot be ascertained by reasonable inquiry and the notice or copy is so required to be served in respect of any land or right over land, by delivering the notice or copy to some person over sixteen years of age resident or employed on the land concerned or by affixing it in a conspicuous position on or near such land.

(2) Where a notice is required by this Act to be served on an occupier and the name of the occupier cannot be ascertained by reasonable inquiry, it may be addressed to “ the occupier ” without naming him.

(3) For the purposes of this section, a company within the meaning of the Companies Act, 1963, 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.