During September, the Filtering Department of Tithonia, Inc. had a beginning Work-in-Process Inventory of 600 units with costs of $140,000. During the month, it started and completed 800 units. It had 220 units in the ending Work-in-Process Inventory. What is the number of equivalent units of production for transferred in units in the Filtering Department in September under the first-in, first-out (FIFO) method? O A. 380 units OB, 1.020 units OC. 600 units O D. 1,620 units