A firm has the following information available on the short-run average total cost for three different plant sizes. Plant Size Output Short-Run Average Total Cost Small 50 units $400 Medium 50 units $220 Large 50 units $200 Which of the following points will fall on the firm's long-run average total cost curve? Multiple choice question. 50 units and $400 50 units and $200 50 units and $220 All three plant sizes and their costs will fall on the curve