29. Which of the following portfolio(s) is (are) on the efficient frontier? A. The portfolio with 20 percent in A and 80 percent in B. B. The portfolio with 15 percent in A and 85 percent in B. C. The portfolio with 26 percent in A and 74 percent in B. D. The portfolio with 10 percent in A and 90 percent in B. E. The portfolio with 20 percent in A and 80 percent in B, and the portfolio with 15 percent in A and 85 percent in B are both on the efcient frontier