(a) Whenever, under this chapter or the certificate of incorporation or by-laws of any corporation or by the terms of any agreement or instrument, a corporation or the board or any committee thereof is authorized to take any action after notice to any person or persons or after the lapse of a prescribed period of time, such action may be taken without notice and without the lapse of such period of time, if at any time before or after such action is completed the person or persons entitled to such notice or entitled to participate in the action to be taken or, in the case of a shareholder, by his attorney-in-fact, submit a signed waiver of notice of such requirements.

(b) Whenever any notice or communication is required to be given to any person by this chapter, the certificate of incorporation or by-laws, or by the terms of any agreement or instrument, or as a condition precedent to taking any corporate action and communication with such person is then unlawful under any statute of this state or of the United States or any regulation, proclamation or order issued under said statutes, then the giving of such notice or communication to such person shall not be required and there shall be no duty to apply for license or other permission to do so. Any affidavit, certificate or other instrument which is required to be made or filed as proof of the giving of any notice or communication required under this chapter shall, if such notice or communication to any person is dispensed with under this paragraph, include a statement that such notice or communication was not given to any person with whom communication is unlawful. Such affidavit, certificate or other instrument shall be as effective for all purposes as though such notice or communication had been personally given to such person.

(c) Whenever any notice or communication is required or permitted by this chapter to be given by mail, it shall, except as otherwise expressly provided in this chapter, be mailed to the person to whom it is directed at the address designated by him for that purpose or, if none is designated, at his last known address. Such notice or communication is given when deposited, with postage thereon prepaid, in a post office or official depository under the exclusive care and custody of the United States post office department. Such mailing shall be by first class mail except where otherwise required by this chapter.