How do UCs consider Subject Tests?

Heyo,

I was wondering if anyone here knows how UCs look at Subject Tests? Do they require all scores to be sent in, or are you allowed to pick and choose which to show?

Some schools recommend, but do not require subject tests. http://admission.universityofcalifornia.edu/freshman/requirements/examination-requirement/SAT-subject-tests/

UCs require you to send all SAT scores if you send any, but that rule is not stated as applying to either ACTs or subject tests.