(a) If the articles of incorporation, a bylaw adopted by the shareholders, or this Chapter provides for voting by a single voting group on a matter, action on that matter is taken when voted upon by that voting group as provided in G.S. 55-7-25.
(b) If the articles of incorporation, a bylaw adopted by the shareholders, or this Chapter provides for voting by two or more voting groups on a matter, action on that matter is taken only when voted upon by each of those voting groups counted separately as provided in G.S. 55-7-25. Action may be taken by one voting group on a matter even though no action is taken at the same time by another voting group entitled to vote on the matter.