(A) After the creation of a joint system, any other authority may become a member of the joint system upon: (1) adoption of a resolution or ordinance by the governing body complying with the requirements of Section 6-25-40 including publication of notice; (2) submission of an application to the joint system; and (3) approval of the application by resolution of the governing body of each member of the joint system except in the case of a joint system organized for the purpose of creating a financing pool, in which case the application must be approved by resolution of the commission. (B) A member may withdraw from a joint system by resolution or ordinance of its governing body. A contractual right acquired or contractual obligation incurred by a member while it was a member remains in full force and effect after the member's withdrawal. (C) Notice of a change in membership must be filed in the Office of the Secretary of State. No change is final until this filing occurs. The filing is not required if a joint system is organized only for the purpose of creating a financing pool. (D) If a new member of the joint system is added hereunder, the approval documentation required under subsection (A)(3) shall determine whether any new commissioners shall be added to the commission as necessary to support such new member of the joint system. If a new commissioner is added, either by the members of the joint system or the Governor, as applicable, each such commissioner shall be appointed immediately.