(a) Any person employed by a school district or county office of education to perform creditable service who is not already a member in the Defined Benefit Program and whose basis of employment is less than 50 percent of the time an employer requires for the full-time position is excluded from mandatory membership in the Defined Benefit Program.
(b) Any person employed by a community college district to perform creditable service pursuant to Section 87474, 87480, 87481, 87482, or 87482.5 who is not already a member of the Defined Benefit Program is excluded from mandatory membership in the Defined Benefit Program.
(c) This section shall apply to persons who perform service subject to coverage under this part and to persons who are employed by employers who provide benefits for their employees under Part 14 (commencing with Section 26000).