David is a director and officer of ABC, Inc. David makes a marketing decision that results in a dramatic decrease in profits forABCand its shareholders. The shareholders accuse David of breaching his fiduciary duty to the corporation. What is David's best defense against this accusation? Later, theABCboard 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?