By Definition, There Will Be Discrimination Between Employees in Performance

By definition, there will be discrimination between employees in performance based pay plans. Rewards awarded contingently cause low performers to improve and high performers to be more satisfied. Which of the following answers the question "How can you do this fairly?"

A) Make sure performance measures are subjective
B) You can not be fair and discriminate at the same time
C) Let the person closest to the performance - the immediate supervisor - make the reward size decision
D) Apply the same reward decision rules to all employees
E) As long as you do not reward on the basis of gender, you are being fair.