(a) A director may waive any notice required by this chapter, the articles of incorporation, or bylaws before or after the date and time stated in the notice. Except as provided by subsection (b) of this Code section, the waiver must be in writing, signed by the director entitled to the notice, and delivered to the corporation for inclusion in the minutes or filing with the corporate records.

(b) A director's attendance at or participation in a meeting waives any required notice to him of the meeting unless the director at the beginning of the meeting (or promptly upon his arrival) objects to holding the meeting or transacting business at the meeting and does not thereafter vote for or assent to action taken at the meeting.