(a) The certificate of incorporation may contain provisions specifying that any class or classes of shares or of any series thereof shall vote as a class in connection with the transaction of any business or of any specified item of business at a meeting of shareholders, including amendments to the certificate of incorporation.

(b) Where voting as a class is provided in the certificate of incorporation, it shall be by the proportionate vote so provided or, if no proportionate vote is provided, in the election of directors, by a plurality of the votes cast at such meeting by the holders of shares of such class entitled to vote in the election, or for any other corporate action, by a majority of the votes cast at such meeting by the holders of shares of such class entitled to vote thereon.

(c) Such voting by class shall be in addition to any other vote, including vote by class, required by this chapter and by the certificate of incorporation as permitted by this chapter.