18 Vacation of office by Commissioner 3. A Commissioner shall vacate his or her office and his or her office shall become vacant— (a) three months after the date upon which he or she gives notice in writing to the President of his or her intention to resign, or on the expiry of such other period of notice as he or she and the President may agree; or (b) on the date he or she begins to serve a sentence of imprisonment imposed without the option of a fine— (i) in Zimbabwe, in respect of an offence; or (ii) outside Zimbabwe, in respect of conduct which, if committed in Zimbabwe, would constitute an offence; or (c) if he or she becomes disqualified in terms of paragraph 2(1)(a), (b) or (c), or in terms of subparagraph (2) of that paragraph, to hold office as a Commissioner; or (d) if he or she is required in terms of section 6 to vacate his or her office. Filling of vacancies on Commission 4. On the death of, or vacation of office by, a Commissioner, the President may appoint a qualified person to fill the vacancy: Provided that if as a result of the vacancy the number of Commissioners falls below the minimum number specified in paragraph 6, the President shall fill the vacancy within three weeks. Chairperson and Vice-Chairperson of Commission 5.(1) The President shall designate one of the Commissioners as Vice-Chairperson of the Commission. (2) The Vice-Chairperson of the Commission shall perform the Chairperson’s functions whenever the Chairperson is for any reason unable to perform them. (3) The Chairperson or Vice-Chairperson of the Commission may at any time resign his or her office as such by one month’s notice in writing to the President. (4) Whenever the office of Chairperson or Vice-Chairperson of the Commission falls vacant, the President or the Minister, as the case may be, shall fill the vacancy within three weeks. Meetings and procedure of Commission 6.(1) The Commission shall hold its first meeting on such date and at such place as the Minister may fix, being not more than three months after the fixed date, and thereafter the Commission shall meet for the dispatch of business as often as is necessary or expedient and, subject to this paragraph, may adjourn, close and otherwise regulate its meetings and procedure as it thinks fit: Provided that the Commission shall meet not less than six times in each year. (2) The Chairperson of the Commission— (a) may at any time convene a special meeting of the Commission; and