Answer:
"D"
Explanation:
Internal supply of employees is a way of managing current or past employees towards an efficient running of the organization . This can occur through transfer , promotion , retirement ,and re-employment of laid of staff.
In order to forecast the internal supply for the incoming year , which is necessary to avoid labor shortage , the estimated no of staff that might be leaving due to retirement , transfer or any other reason is deducted from the current staff strength, and the estimated inflow due to new employment , recall of old staff or inward transfer is added.