31J. Any notice, order or document required or authorised to be served under this Part shall be deemed to be sufficiently served —
(a)
by delivering a copy thereof personally or by leaving it with some adult person at the last known place of residence or business of the person on whom it is to be served; or
(b)
by sending it by registered post addressed to the person on whom the notice is to be served at his address as stated in the appropriate register.