(b) The member earlier elected option 1, 2, 4A or 4B, having named the member's spouse as contingent annuitant, and said spouse has died or has waived all survivor benefits as provided in subsection (2) of this section.
Should a member make an election under this subsection (6), upon notification to the board, the member's benefit on the first day of the month following the effective date of the election will thereafter become the optional retirement allowance elected, calculated as of the date of retirement pursuant to subsection (1) of this section, in addition to any postretirement allowance adjustments that may have accrued from that time.