(A) Amounts due to a retirant receiving a retirement allowance under the plan described in division (B)(3)(e) of section 3309.46 of the Revised Code and unpaid at death shall be paid to the retirants surviving beneficiaries under the plan on a prorated basis based on the monthly benefit payable to the beneficiary compared to the total monthly benefits payable to all beneficiaries.

(B) Beneficiaries designated in a plan described in division (B)(3)(e) of section 3309.46 of the Revised Code shall be prioritized for purposes of calculation.

(1) A beneficiary who is a former spouse whom the member has been ordered to provide a specified amount to in an order described in division (B)(1)(b)(ii) of section 3309.46 of the Revised Code shall have priority over all other beneficiaries. When a member is subject to more than one order described in division (B)(1)(b)(ii) of section 3309.46 of the Revised Code, the former spouses shall be entitled to beneficiary priority in order of earliest retention by the retirement system.

(2) A current spouse shall have priority over any beneficiaries who are not the subject of an order described in division (B)(1)(b)(ii) of section 3309.46 of the Revised Code.

(3) The member shall designate the priority of any beneficiary who is not a former spouse and the subject of an order described in division (B)(1)(b)(ii) of section 3309.46 of the Revised Code or a current spouse.

(C) In no event shall a member have more than four beneficiaries under the plan described in division (B)(3)(e) of section 3309.46 of the Revised Code.