Converted sick leave hours that are not used prior to an employee's retirement date shall be used under the:
(1) Unused Sick Leave Retirement Option Program I under Section 63A-17-507 if earned prior to January 1, 2006, unless the transfer is made under Subsection 63A-17-508(1)(c); or
(2) Unused Sick Leave Retirement Option Program II under Section 63A-17-508 if earned on or after January 1, 2006.