N.C. Gen. Stat. § 55A-8-07: Resignation of directors.

(a) A director may resign at any time by communicating his resignation to the board of directors, its presiding officer, or to the corporation.

(b) A resignation is effective when it is communicated unless the notice specifies a later effective date or subsequent event upon which it will become effective. (1993, c. 398, s. 1.)