QUESTION 4 Which of the following is correct? None of these. 0 If a stock has a beta of 1 , then its required rate of return must be the same as the whole stock market. O If a stock has a beta of 1, then its required rate of return must be the same as a risk-free security. O If a stock has a beta of 2, then it is too risky to be worth purchasing. 0 If a stock has a beta oro, then its required rate of return must be 0