Which one of the following statements are correct concerning diversifiable risks? I. Diversifiable risks can be essentially eliminated by investigating in thirty unrelated securitites 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