(b) if he has been convicted of any offence and sentenced to imprisonment for a term of not less than four months;

(c) if he becomes a bankrupt;

(d) if he is of unsound mind or is otherwise incapable of discharging his duties; or

(e) if he absents himself from three consecutive meetings of the Commission without the leave of the Chairman or, in the case of the Chairman, without the leave of the Minister.