N.C. Gen. Stat. § 54-109.68: Security.

In addition to generally accepted types of security, the endorsement of a note by a surety, comaker or guarantor, or assignment of shares, in a manner consistent with the laws of this State, shall be deemed security within the meaning of Articles 14A to 14L of this Chapter. The adequacy of any security shall be determined by the board of directors subject to Articles 14A to 14L of this Chapter and the bylaws. (1975, c. 538, s. 1.)