N.C. Gen. Stat. § 159B-21
Bonds issued by a municipality or joint agency under the provisions of this Chapter are hereby made securities in which all public officers and agencies of the State and all political subdivisions, all insurance companies, banking associations, investment companies, executors, administrators, trustees and other fiduciaries may properly and legally invest funds, including capital in their control or belonging to them. Such bonds are hereby made securities which may properly and legally be deposited with and received by any officer or agency of the State or any political subdivision for any purpose for which the deposit of bonds or obligations of the State or any political subdivision is now or may hereafter be authorized by law.
N.C. Gen. Stat. § 159B-21