The covariance of returns of Stock 1 with Stock 2 is 150. The covariance of Stock 3 with Stock 4 is 200. The covariance of Stock 5 with Stock 6 is -100. Which of the following statements is (are) definitely true? I. The correlation coefficient between Stock 1 and Stock 2 does not equal the correlation coefficient between stock 5 and 6. II. The correlation coefficient between Stock 1 and Stock 2 does not equal the correlation coefficient between stock 3 and 4. III. The correlation coefficient between Stock 3 and Stock 4 does not equal the correlation coefficient between stock 5 and 6. IV. The correlation coefficient between Stock 1 and Stock 2 is positive A) I and III only I, III, and IV only All are definitely true E) None are definitely true only