Risk pooling enables a lower total inventory level without affecting service levels based on which of the following assumptions?

Risk pooling enables a lower total inventory level without affecting service levels based on which of the following assumptions?
A . Inventory turnover ratio can be reduced.
B. Aggregate demand is more accurate than disaggregate demand.
C. The planning time fence can be adjusted as needed.
D. The supplier shares some risk for holding inventory.

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Answer: B