A firm sells a product whose demand over the next couple of years will be stable (so the order-up-to model is used to manage its inventory). When the demand uncertainty is small (for example, the weekly demand has a mean of 100 and a standard deviation of 5), the main benefit of reducing the lead time is 

a. To do more lead-time pooling. 

b. To reduce the expected on-hand inventory at the end of every period. 

c. To increase the stockout probability. 

d. To reduce the on-order inventory.