Which of the following statements are correct concerning diversifiable risks? 1. Diversifiable risks can be essentially eliminated by investing in about 20-30 unrelated securities. II. There is no reward for accepting diversifiable risks. III. Diversifiable risks are generally associated with an individual firm or industry. IV. Beta measures diversifiable risk. I and Ill only A I, II and III only B. C. I, II, III, and IV II and IV only D