Cornerstones of Managerial Accounting 6th Edition by Maryanne Mowen,Don Hansen ,Dan Heitger

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Suppose that a material has a lead time of four days and that the average usage of the material is 12 units per day. The maximum usage is 15 units per day. What is the safety stock?
a. 3
b. 12
c. 9
d. 15
e. 5