Question 7 (1 point) Which of the following statements is not always true with respect to the four rules of portfolio theory None of the answers is correct Portfolio weights must sum to one. Portfolio risk measured by beta is the weighted average of the betas of the individual securities included in the portfolio. . Portfolio risk measured as the standard deviation is the weighted average of the standard deviations of the individual securities included in the portfolio. Portfolio realized returns are the weighted average of the realized returns of the individual securities included in the portfolio