The three main inputs of a material requirements planning $($MRP$)$ system are $\_\_\_\_\_\_\_\_.$

a$.$

inventory records, annual sales forecast, and a master production schedule

b$.$

Pareto analysis results, inventory records, and a master production schedule

c$.$

required human resources, machine resources, and available resources

d$.$

required manufacturing resources, human resources, and master production schedule

e$.$

bill of material, a master production schedule, and the inventory record