When Enron was still in business, it used a performance system that ranked employees within a business unit against each other in order to calculate bonuses. The highest bonus, awarded only to top-tier employees, only went to 1% of the workers in a business unit. Enron was using a(n) _______ appraisal system. a. Trait b. Behavioral c. Objective d. Forced ranking e. 360-degree f. Percent-capitalization