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

(b) Where voting as a class is provided in the certificate of incorporation or the by-laws, 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 members 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 members 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 or by the certificate of incorporation or the by-laws as permitted by this chapter.