Suppose one uses the single-index model to estimate characteristics of securities.Which of the following statements is correct? (a)The covariances between securities are the same as in the data. (b)The variance of a portfolio is the same as in the data. (c)The expected return and the variance of a security are the same as in the data. (d)The expected return,variance and covariances of a security are the same as in the

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