(1) Service of a notice or other document on any person for the purpose of or in relation to any proceedings under this Part may be effected by delivering it to the person to whom it relates or by sending a copy of the document by registered prepaid post in an envelope addressed to the person to be served at that person's last known residence or place of business in the State.
(2) In the case of a company to which the Companies Act, 1963, applies such service may be effected by delivering the document to, or by sending a copy of the document by registered prepaid post in an envelope addressed to, the company at its registered office.
(3) In the case of a body corporate to which subsection (2) does not apply or any unincorporated body of persons, such service may be effected by sending a copy of the document by registered prepaid post in an envelope addressed to the body at any place in the State where that body conducts its business or in such other manner as an originating summon