4.—(1) The chairman shall be appointed for a period not exceeding 4 years.
(2) A member shall be appointed for a period not exceeding 4 years.
(3) The period of appointment of the chairman and of a member shall be determined by the Department.
(4) Subject to Article 5 the chairman or a member of the Agency may, on the termination of the period of appointment, be eligible for re-appointment for such further period, not exceeding 4 years, as the Department may in any particular case determine.
(5) The Department may instead of re-appointing the chairman or a member on the termination of their period of appointment, extend their appointment for such further period as may appear reasonable in the particular circumstances but the period by which an appointment is extended must not exceed 4 years.