The Hastings Company is a nation-wide wholesaler for small electronic devices. One of its most popular items is a new GPS unit called the WAMI-1000. The company operates 365 days (52 weeks) in a year. Hastings has gathered the following information: Average demand = 1000 units/year Standard deviation of weekly demand = 200 units Average lead time = 5 weeks Standard deviation of lead time= 1 week Z (service level) =1.04 What is the optimal amount of reorder point for the company? Select one: O a. 6157.27 O b. 1139.27 O c. 1157.27 O d. 6139.27