California Code, Probate Code - PROB § 9730

(a) Direct obligations of the United States, or of the State of California, maturing not later than one year from the date of making the investment.

(b) An interest in a money market mutual fund registered under the Investment Company Act of 1940 (15 U.S.C. Sec. 80a-1, et seq.) or an investment vehicle authorized for the collective investment of trust funds pursuant to Section 9.18 of Part 9 of Title 12 of the Code of Federal Regulations, the portfolios of which are limited to United States government obligations maturing not later than five years from the date of investment and to repurchase agreements fully collateralized by United States government obligations.

(c) Units of a common trust fund described in Section 1585 of the Financial Code. The common trust fund shall have as its objective investment primarily in short term fixed income obligations and shall be permitted to value investments at cost pursuant to regulations of the appropriate regulatory authority.