Notwithstanding paragraphs (b)(1), (2), (3) and (4) of this section, a corporation may elect by a provision of its original certificate of incorporation or any amendment thereto to be governed by this section; provided that any such amendment to the certificate of incorporation shall not apply to restrict a business combination between the corporation and an interested stockholder of the corporation if the interested stockholder became such before the date and time at which the certificate filed in accordance with § 103 of this title becomes effective thereunder.
8 Del. C. § 203