The Assembly Department of GigaGo, Inc., manufacturer of computers, had 4,000 units of beginning inventory in September, and 7,000 units were transferred to it by the Production Department. The Assembly Department completed 3,500 units during the month and transferred them to the Packaging Department. Calculate the total number of units accounted for by the Assembly Department if it had 7,500 units in ending inventory. The weighted - average method is used. O A. 7,500 units O B. 7,000 units O C. 11,000 units O D. 4,000 units