You observe that AT&T stock and the S&P 500 have the following weekly returns: Week 1 2 3 4 AT&T return 0.005 0.010 -0.003 -0.005 S&P 500 return 0.001 0.005 -0.005 -0.001 If this pattern of stock returns is typical of AT&T stock, and you calculated a beta against the S&P 500, which of the following is true? O A. AT&T's beta is negative. OB. AT&T's beta is positive. O C. AT&T's beta is zero. O D. Cannot be determined from information given. Your retirement portfolio comprises 200 shares of the S&P 500 fund (SPY) and 100 shares of iShares Barclays Aggregate Bond Fund (AGG). The price of SPY is $129 and that of AGG is $105. If you expect the return on SPY to be 7% in the next year and the return on AGG to be 5%, what is the expected return for your retirement portfolio? O A. 6.74% B. 148.35% O C. 6.42% O D. 5.78%