A monopoly is producing output so that average total cost is $30, while marginal revenue and marginal costs are also $30. The selling price is $60 and the quantity 100 units. If ATC is at its minimum level and the ATC curve is U-shaped, the firm
a.should increase output to maximize profits
b. is making a $3000 profit
c. should reduce output to maximize profits
d. two of the oher answers are correct