3.— (1) A notification, notice or other document that is required to be given to or served on a person under this Act shall be addressed to the person by name and shall be given to or served on 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 carries on business or, in a case in which an address for service has been given, at that address, or

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

(2) For the purposes of subsection (1), a company registered under the Companies Acts is deemed to be ordinarily resident at its registered office, and every other body corporate and every unincorporated body is deemed to be ordinarily resident at its principal office or place of business.