The Board of Education shall establish citizen advisory committees when there is a definite function to be performed. All appointments of citizens to advisory committees shall be approved by the Board. All appointments of staff members to citizen advisory committees shall be made by the Superintendent. Staff members shall never constitute more than a minority of any such committee. Every effort shall be made to ensure that the makeup of an advisory committee is as truly representative of the community as possible. The chairperson of an advisory committee shall be chosen from among the lay members. Board members may be ex officio members of an advisory committee.