The commission contemplated by Article IV of the above compact shall consist of three (3) members, as follows: One legislator, who may either be a member of the Mississippi State Senate or the Mississippi House of Representatives, to be appointed by the Mississippi Commission on Interstate Co-operation, and two (2) executive officers or employees in the executive branch of the state government whose duties, experience and abilities qualify them for such a position, to be appointed by the governor. Each member of the commission must be a qualified voter of this state and shall serve for a term of four (4) years and be eligible to immediately succeed himself.