Which statement BEST explains how managerial job performance should be evaluated?

A$.$ Efficiency is the best way to measure hourly managerial employee activities.

B$.$ Effectiveness is a measure defined by the manager's ability to get the most output from the least amount of input or resources

C$.$ Effectiveness and efficiency go hand in hand, and a good manager accomplishes both.

D$.$ Effectiveness describes how managers are able to get their employees to work more quickly.

E$.$ Effectiveness is a true and valid measure of a manager's abilities and job performance.