(b) (c) (d) (e) (f) (g) the Speaker and Deputy Speaker; a Minister; the Attorney General; a member of Parliament; a member of any commission, authority, council or committee established by this Constitution; and a public officer. (4) Subject to the provisions of this article, Parliament may make laws providing for the resignation of persons holding offices established by this Constitution not provided for in this article. 253. Reappointments and concurrent appointments. (1) Where any person has vacated an office established by this Constitution, that person may, if qualified, again be appointed or elected to hold that office in accordance with the provisions of this Constitution. (2) Where a power is conferred by this Constitution on any person to make any appointment to any office, he or she may appoint a person to that office even while another person holds the office, when that other person is on leave of absence pending the relinquishment of the office. (3) Where two or more persons hold the same office by reason of an appointment made by virtue of clause (2) of this article, then, for the purposes of any function conferred on the holder of that office, the person last appointed shall be taken to be the sole holder of that office. 254. Pension. (1) A public officer shall, on retirement, receive such pension as is commensurate with his or her rank, salary and length of service. (2) The pension payable to any person shall be exempt from tax and shall be subject to periodic review to take account of changes in the value of money. (3) The payment of pension shall be prompt and regular and easily accessible to pensioners. 255. Right of citizens to demand referenda.