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Answer (D) is correct . Lot sizes based on immediate need are typical of just-in-time systems, while lot sizes based on formulas are characteristic of traditional inventory management systems.

Answer (A) is incorrect because The difference in lead times is a correct comparison between the two systems.
Answer (B) is incorrect because Minimization of inventory is a goal of the just-in-time system since many inventory-related activities are viewed as nonvalue-added.
Answer (C) is incorrect because The focus of quality control under a just-in-time system shifts from the discovery of defective parts to the prevention of quality problems. Zero defects are the ultimate goal.