Which of the following best defines the mean-variance efficient frontier?

Question

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The mean-variance efficient frontier is the set of portfolios that offer the greatest reward for each unit of risk and the lowest risk for each level of reward. It is not the portfolio of all risky assets in existence (A) nor is it solely based on greatest return (C) or lowest risk (D). It is a combination of both risk and reward in order to achieve optimal portfolio construction. The mean-variance efficient frontier is the set of portfolios that provide the greatest reward for each unit of risk and the lowest risk for each level of reward. It is not the portfolio of all risky assets in existence, nor is it the set of portfolios that offer the greatest return or the lowest risk.

Which of the Following Best Defines the Mean-Variance Efficient Frontier