48. DEF Corp. has a board of five directors. The company president learns of a chance to acquire a related business and wants the board to consider and approve the deal. The president sends a notice to the directors of a special meeting to happen in three days, but not to director D for whom the corporation has no address. The meeting is attended by three directors (but not D), two of them by Skype. The three at the meeting all approve the acquisition. Is their action valid? A. yes notice was sufficient since it went to a majority of the board at least two days before the meeting date B. yes the quorum at a special meeu'ng, unlike a regular meeting, is one-third of the board C. no notice must be sent to each director, and the failure to send a notice to D invalidates the meeting D. no a board meeting must he in person, unless the articles or bylaws specifically allow electronic or telephonic presence of directors at meetings