Which of the following statements concerning the Markowitz efficient frontier is correct?
A. A portfolio that offers the highest rate of return with the lowest degree of risk is on the efficient frontier.
B. A portfolio that offers the lowest rate of return for a higher degree of risk is on the efficient frontier.
C. A portfolio that offers the lowest degree of risk for a given rate of return is above the efficient frontier.
D. A portfolio that offers the highest rate of return for a given degree of risk is on the efficient frontier.