A competitive firm has a quadratic cost function of the form: c(q) = 10 + 2q2. In the short run when fixed costs
are unavoidable the firm should: a) Continue operating for any positive price. b) Continue operating provided that price is grater than or equal to 10. c) Shut down if total costs (variable plus fixed) falls below total revenue. d) Shut down if average cost is greater than price.