Which of the following statements are correct concerning diversifiable risks? I. Diversifiable risks can be essentially eliminated by investing in thirty 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. A. I and III only B. II and IV only C. I and IV only D. I, II and III only E. I, II, III, and IV