Any party may obtain discovery by taking a deposition by written questions instead of by oral examination. Except as modified in this chapter, the procedures for taking oral depositions set forth in Chapters 9 (commencing with Section 2025.010) and 10 (commencing with Section 2026.010) apply to written depositions.
Source:
Section 2028.010, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=2028.010..