Security A: E(r) = .15; standard deviation = ..2000 Security B: E(r) = .10; standard deviation = .1500 Security C: E(r) = .12; standard deviation = .3160 Security D: E(r) = .13; standard deviation = .2500 If you were going to form a complete portfolio consisting of the risk free asset and one risky asset, which trisky asset would you choose