A. Notwithstanding any other provision of law to the contrary, any municipality which has its employees covered under Social Security and enrolled in Plan B of this system, shall have the option of becoming members of Plan A. The municipality shall notify the system of its intention to be enrolled in Plan A in writing. The municipality shall not be entitled to transfer the service and contributions standing to their credit in Plan B to Plan A. After the effective date of such transfer, both the employee and employer shall make the current contributions required by each under Plan A.
B. The provisions of R.S. 11:142 relative to eligibility for retirement and benefit computation shall be applicable to any member who has credit in Plan A and Plan B as if the two plans are two distinct, separate, and independent public retirement systems. However, for benefit computation purposes, final compensation, as defined by R.S. 11:732(15), shall be based on all service in the system, regardless of in which plan, as if all credit were in the same plan.