A. The officers of the department shall be the secretary, the undersecretary, the deputy secretary if a deputy secretary is appointed, and assistant secretaries, each of whom shall be selected and shall perform functions as provided in this Title.
B. No person serving as a secretary, deputy secretary, undersecretary, or assistant secretary shall receive any additional salary from the state other than that salary which he receives by virtue of serving in any one of such offices. Any statewide elected official appointed to serve as a secretary, deputy secretary, undersecretary, or assistant secretary shall not receive any additional salary from the state other than that salary which he receives as a statewide elected official.
C. Notwithstanding any provision herein to the contrary, subject to approval of the governor, any person, including any statewide elected official, serving or appointed to serve as a secretary, undersecretary, deputy secretary, or assistant secretary may receive additional compensation for part-time services rendered as an instructor in post-secondary educational institutions, or as a member of the National Guard.