(a) Except as otherwise provided in subsection (b) of this section, the articles of incorporation, or the bylaws, if a vacancy occurs on the board of directors, including a vacancy resulting from an increase in the number of directors, the vacancy may be filled by a majority of the directors remaining in office even if they constitute less than a quorum.
(b) Except as otherwise provided in the articles of incorporation or bylaws, a vacancy in the position of a director who is:
(1) Elected by a voting group of members, by a chapter or other organizational unit of members, or by a region or other geographic grouping of members, shall be filled during the first 3 months after the vacancy occurs only by that voting group or chapter, unit, region, or grouping;
(2) Appointed by persons other than the members, may be filled only by those persons; or
(3) Designated in the articles of incorporation or bylaws shall not be filled by action of the board of directors.
(c) A vacancy that will occur at a specific later time, by reason of a resignation effective at a later time under § 29-406.07(b) or otherwise, may be filled before the vacancy occurs but the new director shall not take office until the vacancy occurs.