Cal. Civ. Proc. Code § 2020.020

A deposition subpoena may command any of the following:

(a) Only the attendance and the testimony of the deponent, under Article 3 (commencing with Section 2020.310).

(b) Only the production of business records for copying, under Article 4 (commencing with Section 2020.410).

(c) The attendance and the testimony of the deponent, as well as the production of business records, other documents, electronically stored information, and tangible things, under Article 5 (commencing with Section 2020.510).