12. An investor invests 40% of his wealth in a risky asset with an expected rate of return of 15% and a variance of 0.04 and 60% in a treasury bill that pays 6%. Her portfolio's expected rate of return is and her portfolio return's standard deviation is 1) 8.0%, 12% 2) 9.6%, 8% 3) 11.4%, 10% 4) 13%, 12% moto of 4% One year