The San Francisco Employees’ Retirement System shall provide concurrent retirement benefits for classified and other noncertificated service in the San Francisco system according to the provisions applicable to miscellaneous employees of the time of the concurrent retirement for:
(a) Members of that system who transfer to the Defined Benefit Program after June 30, 1972.
(b) Persons who were members of both the San Francisco system and the Defined Benefit Program on June 30, 1972.
(c) A person who could have qualified under subdivision (b) if he or she had not taken a refund from either the San Francisco system or the Defined Benefit Program, but not both, provided the person qualifies for and redeposits prior to retirement.