Consider the following probability distribution for stocks A and B : State Probabilitv Return on Stock A Raturn an \&tnck B Which of the following portfolio(s) is(are) on the efficient frontier? The portfolio with 10 percent in A and 90 percent in B. A and B are both on the efficient frontier. The portfolio with 15 percent in A and 85 percent in B. The portfolio with 20 percent in A and 80 percent in B. The portfolio with 26 percent in A and 74 percent in B