84.— (1) Subject to subsection (2) and section 83(4), (5) and (6), a direction may be given to, and any proceedings to enforce the direction may be served on or otherwise made upon—

(a) any person in the State,

(b) any Irish citizen outside the State, or

(c) any person in an Irish registered vessel or aircraft or an Irish diplomatic mission outside the State.

(2) Paragraphs (a) and (c) of subsection (1) shall not apply to a person who at the time concerned is entitled to diplomatic immunity in the State.