Answer: D - incentive systems
Explanation: A incentive system is a system whereby rewards are offered to employees to stimulate their motivation to work.
Incentive can be monetary, non monetary, on target or career prospect. It aids employees reach and supersede their assigned duties within a limited time frame.
Incentive reward system is well appreciated by employees as it shows them that their efforts are being appreciated by their employers and thereby put in more effort to do more.