N.C. Gen. Stat. § 28A-22-6
The executor, trustee, or other fiduciary having discretionary powers under a will or trust indenture with respect to the selection of assets to be distributed in satisfaction of a devise or transfer in trust to or for the benefit of the surviving spouse of a decedent shall be authorized to enter into agreements with the Commissioner of Internal Revenue of the United States of America, and other taxing authorities, requiring the fiduciary to exercise the fiduciary's discretion so that cash and other properties distributed in satisfaction of such devise or transfer in trust will be fairly representative of the net appreciation or depreciation in value on the date, or dates, of distribution of all property then available for distribution in satisfaction of such devise or transfer in trust. Any such fiduciary shall be authorized to enter into any other agreement not in conflict with the express terms of the will or trust indenture that may be necessary or advisable in order to secure for federal estate tax purposes the appropriate marital deduction available under the Internal Revenue Laws of the United States of America and to do and perform all acts incident to such purpose.
N.C. Gen. Stat. § 28A-22-6