Which of the following statements best describes the actions of a price-discriminating monopolist?

a. A price-discriminating monopolist will price where marginal revenue equals marginal cost for each different group of demanders

.b. A price-discriminating monopolist will charge a higher price for more elastic demanders

c. A price-discriminating monopolist does NOT need to worry about customers reselling the good to others who were charged more.

d. A price-discriminating monopolist will charge a lower price for more inelastic demanders.