$5.$ Consider the following statements about goal congruence:

I. Goal congruence is obtained when managers of submits throughout an organization strive to achieve the goals set by top management.

II$.$ Managers are often more concerned about the performance of their own subunits rather than the performance of the entire organization $.$

III. Achieving goal congruence in most organizations is relatively straightforward and easy to accomplish.

Which of the above statements is $($are$)$ true?