Answer:
D. the safety stock concept
Step-by-step explanation:
Safety stock describes a quantity of inventory that a business maintains in its custody at all times. The objective of keeping safety stock inventory is to prevent the business from experiencing stock-outs. Applying the concept of safety stock means not allowing the inventory to go below the level marked at safety stock.
The technique of safety stock demands that stock be ordered every time inventory approaches safety stock. Allowing inventory to fall below the safety stock is risking running out of stock leads to halting production.