David is a director and officer of ABC, Inc. David makes a marketing decision that results in a dramatic decrease in profits for ABC and its shareholders. The shareholders accuse David of breaching his fiduciary duty to the corporation. What is David’s best defense against this acusation? Later, the ABC board considers a resolution for the firm to compete with XYZ Corporation. David is a director and shareholder of XYZ. What is David’s responsibility in this situation?