Answer:
Have the highest risk and rates of return and the highest standard deviations.
Explanation:
The efficient portfolios of N risky operatives is the set of optimal portfolios that offer the highest expected return for a defined level of risk or the lowest risk for a given level of expected return. And in other words, portfolios that lie below the efficient frontier are been described as sub optimal because they do not provide enough return for the level of risk. Portfolios that cluster to the right of the efficient frontier are sub optimal because they have a higher level of risk for the defined rate of return.