Except as provided in subdivisions (d) and (e) of Section 7522.02, each public employer and each public retirement system that offers a defined benefit plan shall offer only the defined benefit formulas established pursuant to Sections 7522.20 and 7522.25 to new members.
Source:
Section 7522.15, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=7522.15..