(a) As used in this Code section, "uncredited full-time service" means employment by the executive branch of the state government after January 1, 1980, and prior to January 1, 1986, on a full-time salaried basis for which the employee was authorized to accrue annual and sick leave but which did not qualify the employee to be a member of the retirement system.

(b) A member may not obtain more than three years of creditable service for uncredited full-time service. The member claiming such creditable service shall pay to the board of trustees the employer and employee contribution that would have been paid to the retirement system if the member had been a member during the period for which creditable service is claimed based on compensation actually received for the service which is claimed as creditable service together with regular interest thereon.

(c) The board of trustees shall require such proof of service and compensation received therefor as may be necessary to carry out the provisions of this Code section.

(d) In order to obtain creditable service under this Code section, a member must make application to the board of trustees not later than January 1, 1999.