Ed Lawrence has OMR100,000 invested. Of that, OMR30,000 is invested in IBM stock, OMR25,000 is invested in T-bills, and the remainder is invested in corporate bonds. Which of the following is true regarding his portfolio? Select one: O a. Ed has 30% of his portfolio invested in Stocks. O b. Changes in the return on IBM stock will have the greatest impact on changes in the portfolio return. O c. If IBM has a beta less than one, the portfolio has a beta greater than one. O d. Ed has 55% of his portfolio invested in corporate bonds e. Ed has 70% of his portfolio invested in risk- free assets