I want to know the answer to the following question:
Which legislative work prohibited the use of racial preferences for admissions in the state of California?
All the background I'm provided with is that "Sander helped to develop a socioeconomically-based affirmative action plan for the UCLA School of Law after the passage of Proposition 209 in 1996, which prohibited the use of racial preferences by public universities in California.". Is that enough to answer the question?