A "retired participant" means: (a) a participant who is eligible for a normal, unreduced, or disability retirement benefit (as determined by the Indiana public employee retirement fund of which the participant is a member) on the participant's last day of service,
(b) a participant who has completed at least 10 years of service as an elected or appointed officer on the participant's last day of service as an elected or appointed officer. For purposes of this subdivision, any partial year of service completed by the participant in the year in which the participant is appointed to fill a vacant elected office shall be one complete year of service, or
(c) beginning July 1, 2021, a participant in PERF My Choice who is the normal retirement age (age 62) and has 5 years of service as of the participant’s last day of service.