Commencing October 1, 1994, each person whose employer participated in the Employees’ Retirement System pursuant to Sections 36-27-7 and 36-27-7.1, whose effective date of retirement for purposes of receiving benefits from the Employees’ Retirement System is prior to October 1, 1994, and who is receiving a monthly allowance or is eligible to receive a monthly allowance from the Employees’ Retirement System, shall receive a cost-of-living increase in the amount of one half the amount provided by the formula in Section 36-27-120. Retirees who chose Options 2, 3, or 4 shall receive the cost-of-living increase reduced by the same percentage as the reduction which occurred because of the option selected unless the designated beneficiary under the option is deceased on October 1, 1994, in which case the increase shall not be reduced. Beneficiaries of deceased members or deceased retirees of employers participating in the Employees’ Retirement System pursuant to Sections 36-27-7 and 36-27-7.1, shall be entitled to the increase the retiree has attained using the formula provided in Section 36-27-120, reduced by the retiree’s option election factor.