(a) The articles of incorporation or a bylaw adopted under Code Section 14-2-1021 may provide for a greater or lesser quorum (but not less than one-third of the votes entitled to be cast) or a greater voting requirement for shareholders (or voting groups of shareholders) than is provided for by this chapter.

(b) An amendment to the articles of incorporation or bylaws that changes or deletes a greater quorum or voting requirement must meet the same quorum requirement and be adopted by the same vote and voting groups required to take action under the quorum and voting requirements prescribed in the provision being amended.