Use the table to answer the next question. Output ATC-1 ATC-2 ATC-3 ATC-4 1,500 $10 $15 $20 $30 2,000 9 12 17 25 2,500 8 10 15 20 3,000 12 7 13 18 3,500 15 6 11 16 4,000 18 10 7 14 4,500 20 12 8 12 5,000 24 15 11 9 5,500 29 19 13 12 6,000 35 25 15 14 Plant sizes get larger as you move from ATC-1 to ATC-4. The firm's minimum efficiency scale occurs at which level of output? Multiple Choice 2,500 units 3,000 units 4,000 units 3,500 units