Cal. Civ. Proc. Code § 2028.070

In addition to any appropriate order listed in Section 2025.420, the court may order any of the following:

(a) That the deponent’s testimony be taken by oral, instead of written, examination.

(b) That one or more of the parties receiving notice of the written deposition be permitted to attend in person or by attorney and to propound questions to the deponent by oral examination.

(c) That objections under Sections 2028.040 and 2028.050 be sustained or overruled.

(d) That the deposition be taken before an officer other than the one named or described in the deposition notice.