Answer (D) is correct . Safety stock involves always keeping enough raw materials on hand to overcome the effects of an interruption in supply. In a JIT system, manufacturers are completely dependent upon the reliability of their suppliers in delivering raw materials as they are needed. Keeping safety stock undercuts the entire philosophy of JIT.
Answer (A) is incorrect because Cells are the configurations of manufacturing equipment that facilitate JIT and lean production.
Answer (B) is incorrect because Kanban is a Japanese system for inventory control that is often implemented as part of JIT manufacturing.
Answer (C) is incorrect because Lean production is often part of a JIT manufacturing system.
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