Traditional portfolio managers prefer well-known companies because I. stocks of well-known firms tend to be less risky than stocks of lesser-known firms. II. individuals are more apt to purchase a mutual fund if it contains stocks of well-known firms. III. window dressing encourages the purchase of well-known stocks. IV. institutional investors tend to exhibit "herd-like" behavior. A) I only B) I and II only C) II and III only D) I, II , III and IV