Which of the following inputs helps an aggregate planner select the rate of output for a facility over the next 3 to 18 months?

A) facility capacity
B) inventory on hand
C) workforce size
D) demand forecasts
E) all of the above

All the options listed (facility capacity, inventory on hand, workforce size, and demand forecasts) are critical inputs for an aggregate planner to determine the optimal rate of output for a facility over the intermediate term (3 to 18 months). These factors collectively help in balancing demand with production capacity, managing inventory levels, and optimizing workforce utilization to meet forecasted demand efficiently.