In $200$ words or less, please: compare the performance $($Sharpe ratio and Sortino ratio$)$ of the S&P$500$ Index and the RSP$-$US ETF over the twelve$-$month period $(1$ Sep $23-30$ Aug $24).$ What explains the difference in performance? explain why the number of assets in the RSP$-$US ETF at any one time is not $500$