California: Two taxpayers are married and filing separately. One of them decides to itemize their federal return. Which of the following describes best the treatment of both the other spouse's federal return and the ability to itemize the state independently?

1. The other spouse can file with the standard deduction for both the federal and the state return.
2. The other spouse must itemize their federal return and since the state and federal returns must match itemization choice, both will also have to itemize the state return.
3. The other spouse must itemize the federal return, but both taxpayers can either take the standard deduction for the state or itemize the state, so long as both taxpayers choose the same treatment for the state return.
4. The other spouse can choose to itemize the federal, but both must itemize the state return.