You have observed the following information about the two stocks you hold in your portfolio: Xxs Yyk Expected Return 15% 9% Standard Deviation 8% 5% Investment Value $30,000 $70,000 The correlation between Xxs and Yyk is -0.40 (negative .40). The standard deviation of your portfolio is closest to: O a. 4.97% O b. 4.24% O c. 3.83% O d. 3.36% e. 5.13%