(a) Regular or special meetings of the board of directors may be held either inside or outside the state.
(b) Regular meetings of the board of directors may be held with or without notice as prescribed in the bylaws. Special meetings of the board of directors shall be held after the notice which shall be prescribed in the bylaws. Attendance of a director at a meeting constitutes a waiver of notice of the meeting, except when a director attends a meeting for the express purpose of objecting to the transaction of any business because the meeting is not lawfully called or convened. The business to be transacted or the purpose of a regular or special meeting of the board of directors need not be specified in the notice of the meeting unless required by the bylaws.