The following lots of Commodity Z were available for sale during the year. Beginning inventory 9 units at $52 First purchase Second purchase Third purchase 17 units at $50 23 units at $58 15 units at $58 The firm uses the periodic system, and there are 21 units of the commodity on hand at the end of th year. What is the ending inventory balance at the end of the year according to the FIFO method? Oa. $3,501 Ob. $1,218 Oc. $3,522 Od. $1,092 L