(a) Adoption of a resolution or ordinance complying with the requirements of § 6-16-40 including publication of notice;

(b) Submission of an application to the joint agency;

(c) Approval of such application by resolution of the governing body of each member of such joint agency.

Any member may withdraw from a joint agency by resolution or ordinance of its governing body. All contractual rights acquired and contractual obligations incurred by a member while it was a member shall remain in full force and effect.

Notice of any change in membership shall be filed in the office of the Secretary of State and no change shall be final until such filing.