The efficient level of the firm described by the table below is: Quantity Variable Fixed Cost Cost 0 $0 $200 1 10 200 2 20 200 3 40 200 4 80 200 5 160 200 6 320 200 7 640 200 Select one: a. 2 units where the MC is at its kiy5466 level and equal to the AVC b. 7 units minimizing the AFC. c. There is no efficient level for this firm O d. 4 units minimizing the ATC. Clear my choice