$($Enter $Y$ for Pareto$-$optimal solutions and $N$ for the non$-$Pareto$-$optimal ones. Questions are graded automatically. If you do not follow the formatting, then your

answer will be graded wrong. If your answer is correct, I will be able to manually change your grade for those questions later, but you will lose $25\%$ of the points.

NO EXCEPTIONS, in order to be fair to everyone in the class.$)$

We are building an investment portfolio. If we care about the Return $($to maximize$),$ Risk $($to minimize$),$ and the EF $($eco$-$friendly, to maximize$),$ which of the

following solutions are for guaranteed to be Pareto efficient $($or Pareto optimal$)$ choices?

The most eco$-$friendly portfolio with return at least $8\%.$

The portfolio that maximizes $"3*$ Return $+EF".$

The portfolio that minimizes risk among those whose return belongs to the top third of returns.

The portfolio that maximizes return whose risk is between $5\%$ and $10\%.$

The portfolio that minimizes $"-$Return $+$ Risk".

The lowest risk portfolio that does not involve any energy or airline stock.