XYZ company uses "Continuous Review System (Q, ROP) " for an item. Lead-time is currently one week. The average demand during the week is 100 units with a standard deviation of 20 units. If the supplier increases lead-time to 4 weeks, what will be the standard deviation of lead-time demand?
a. 40 80
b. 17.89
c. 44.72
d. 120
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