California Code, Vehicle Code - VEH § 34631

(a) A certificate of insurance, issued by a company licensed to write insurance in this state, or by a nonadmitted insurer subject to Section 1763 of the Insurance Code, if the policies represented by the certificate comply with Section 34630 and the rules promulgated by the department pursuant to Section 34604.

(b) A bond of a surety company licensed to write surety bonds in the state.

(c) Evidence of qualification of the carrier as a self-insurer as provided for in subdivision (a) of Section 34630. However, any certificate of self-insurance granted to a motor carrier of property shall be limited to serve as proof of financial responsibility under paragraphs (1) and (2) of subdivision (a) of Section 34631.5 minimum limits only and shall not be acceptable as proof of financial responsibility for the coverage required pursuant to paragraph (3) or (4) of subdivision (a) of Section 34631.5.

(d) Evidence on a form that indicates that coverage is provided by a charitable risk pool operating under Section 5005.1 of the Corporations Code, if the registered owner of the vehicle is a nonprofit organization that is exempt from taxation under paragraph (3) of subsection (c) of Section 501 of the United States Internal Revenue Code. The form shall include all of the following: