(a) The Department of Natural and Cultural Resources shall maintain and administer State historic sites and museums under the management of the Office of Archives and History for the collection, preservation, study, and exhibition of authentic artifacts and other historical materials relating to the history and heritage of North Carolina. The Department, with the approval of the Historical Commission, may acquire, either by purchase, gift, or loan such artifacts and materials, and, having acquired them, shall according to accepted museum practices classify, accession, preserve, and where feasible exhibit such materials and make them available for study. Within available funds, one or more branch museums of history or specialized regional history museums may be established and administered by the Department. The Department of Natural and Cultural Resources, subject to the availability of staff and funds, may give financial, technical, and professional assistance to nonstate historical museums sponsored by governmental agencies and nonprofit organizations according to regulations adopted by the North Carolina Historical Commission. Notwithstanding Article 3A of Chapter 143 of the General Statutes, G.S. 143-49(4), or any other law pertaining to surplus State property, the Department of Natural and Cultural Resources may, with the explicit approval of the North Carolina Historical Commission sell, lease, donate, trade, or place on loan any artifact owned by the State of North Carolina and in the custody of and curated by the Office of Archives and History, unless the sale, lease, donation, trade, or loan would be contrary to the terms of acquisition. The net proceeds of any sale or lease, after deduction of the expenses attributable to that sale or lease, shall be deposited in the Office of Archives and History Artifact Fund to the credit of the museum or archives that had custody of the artifact sold or leased and shall be used only for the expenses associated with the purchase, maintenance, or conservation of other artifacts. No artifact curated by any agency of the Department of Natural and Cultural Resources may be pledged or mortgaged.