If a competitive firm's marginal profit is positive at an output of 1000 units,
a. at 1000 units, Marginal revenue < MC
b. it will not produce 1000 units
c. at 1000 units, marginal price derivative is equal to the Marginal Giffen good.
d. at 1000 units, Marginal revenue = MC
e. it should produce 1000 units