5. Given the information below about the risks and returns of five alternative portfolios, plot the risks and returns. Which do not represent efficient portfolios?

\begin{tabular}{cc|c} \hline Portfolio & Expected Return & Risk \\ \hline I & 0.05 & 0.00 \\ II & 0.075 & 0.12 \\ III & 0.075 & 0.05 \\ IV & 0.075 & 0.04 \\ V & 0.05 & 0.05 \\ \hline \end{tabular}