Stuart Company uses the periodic inventory system. Inventory records for 2019 are as follows. January 1 -- Beginning inventory .......... March 26-- Purchase May 19 -- Purchase July 13 -- Purchase .. November 20 - Purchase .... December 31- Ending inventory 2,000 units 4,000 units .6,000 units 4,000 units 4,000 units ...9,000 units Stuart sells its units for $2 each. Based on the information above, which of the following statements is correct? Stuart sold 9,000 units during 2019. Stuart had 20,000 units remaining at December 31, 2019. Stuart sold 20,000 units during 2019. Cost of goods sold for 2019 is $22,000. Stuart had 20,000 units available to sell during 2019