In Managing Employees Under an Incentive Pay Plan,a Manager Should

In managing employees under an incentive pay plan,a manager should

A) set "stretch" goals that are very difficult (perhaps impossible) to achieve.
B) set goals with employees,but then leave them alone to pursue those goals.
C) change the plan frequently to continue to motivate subordinates.
D) regularly communicate with employees about the plan.
E) design complex plans that cover all contingencies.