Investments, contracts, and agreements may be held in safekeeping with:
(1) any Federal Reserve bank;
(2) any bank authorized under the laws of the United States or any state to exercise corporate trust powers, including, but not limited to, the bank from which the investment is purchased;
(3) a primary reporting dealer in United States government securities to the Federal Reserve Bank of New York; or
(4) a securities broker-dealer having its principal executive office in Minnesota, licensed under chapter 80A, or an affiliate of it, and regulated by the Securities and Exchange Commission; provided that the government entity's ownership of all securities is evidenced by written acknowledgments identifying the securities by the names of the issuers, maturity dates, interest rates, CUSIP number, or other distinguishing marks.