Which statements about beta as a measure of risk and variance as a measure of risk are correct?Beta is a measure of market risk and is useful in the context of a well-diversified portfolio.Beta measures the sensitivity of the security returns to changes in market returns.The market portfolio has a beta of one.The market portfolio has a beta of zero.Variance measures the total risk of a security and is a measure of market risk.Total risk of a security consists of unique risk and idiosyncratic risk.In a well-diversified portfolio, unique risks tend to cancel each other out and only diversifiable risk remains.

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