A portfolio of two risky assets has variance given by o = a?o? + 2a(1- a)p120,02 + (1 - a)*a A. Write this portfolio's variance when asset returns are perfectily correlated (P2= 1)? (5 pts) B. Write this portfolio's variance when asset returns are uncorrelated. (5 pts) c. write this portfolio's variance when p12 = -1 (5 pts) D. Using youranswer from C, show the choice of a that creates a risk-free portfolio (5 pts)