1 2 4 You observe that AT&T stock and the S&P 500 have the following weekly returns: Week AT&T return S&P 500 return 0.005 0.001 0.010 0.005 3 -0.003 -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? A. AT&T's beta is negative. OB. AT&T's beta is positive. C. AT&T's beta is zero. OD. Cannot be determined from information given