Which of the Following Is not one of the Four

Multiple Choice

Which of the following is not one of the four things needed for aggregate planning?

A) a logical overall unit for measuring sales and output
B) a method for determining costs, such as hiring, layoffs, and inventory costs, associated with production schedules
C) a mathematical model that will minimize costs over the intermediate planning period
D) an aggregate demand forecast for an intermediate planning period
E) All of these are needed for aggregate planning.