please with excel

29) Consider the following probability distribution for stocks A and B : Which of the following portfolio(s) is(are) on the efficient frontier? A) The portfolio with 20 percent in A and 80 pereent in B. B) The portfolio with 15 pereent 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) A and B are both on the efficient fronticr