Which of the following statements is true for a non-price discriminating monopoly?
a the monopolist's demand curve slopes down, its marginal revenue curve lies below the demand curve, and the marginal revenue curve is also the average revenue curve.
b the monopolist's demand curve slopes down and is also the average revenue curve, and the marginal revenue curve lies below the demand curve.
c the monopolist's demand curve, average revenue curve, and marginal revenue curve are all the same and all slope down.
d the monopolist's demand curve slopes down and is also the total revenue curve, and the marginal revenue curve lies below the demand curve.