(a) A public employer that does not offer a supplemental defined benefit plan before January 1, 2013, shall not offer a supplemental defined benefit plan for any employee on or after January 1, 2013.
(b) A public employer that provides a supplemental defined benefit plan, including a defined benefit plan offered by a private provider, before January 1, 2013, shall not offer a supplemental defined benefit plan to any additional employee group to which the plan was not provided before January 1, 2013.
(c) Except as provided in Chapter 38 (commencing with Section 25000) of Article 1 of Part 13 of Title 1 of the Education Code, a public employer shall not offer or provide a supplemental defined benefit plan, including a defined benefit plan offered by a private provider, to any employee hired on or after January 1, 2013.