Which of the following is the best way to prevent an agency problem between shareholders and managers? Select one: O a. Reward managers if they keep costs below the budgeted amount. O b. Pay managers a bonus if their division exceeds its targeted market share. O c. Maintain a proportional relationship between a manager's bonus and the number of employees in the firm. O d. Pay managers a bonus if their division exceeds its quarterly sales target. O e. Compensate managers to a significant degree with shares of stock in their firm