A. The provisions of this article shall apply to every public officer, deputy or employee of the state, or of any department, institution or agency thereof, and to a member of any board, commission or other agency of the state when traveling on necessary public business away from his designated post of duty and when issued a proper travel order.

B. The designated post of duty of members of boards, commissions, authorities, councils and committees who are not fulltime employees of the agency served by the board, commission, authority, council or committee shall be deemed to be their place of residence.