QUESTION $5$

Four different forecasting methods were applied to a set of time$-$series data. The root$-$mean$-$square error $($RMSE$)$ was calculated for each method and is provided in the table below. Rank the four methods from the most accurate to the least accurate?

$\backslash$table$[[$Method$,$A$,$B$,$C$,$D$],[$RMSE$,10\mathrm{.}1,11\mathrm{.}9,12\mathrm{.}5,9\mathrm{.}5]]$

A$.$ C$,$ B$,$ A$,$ D

B$.$ C$,$ B$,$ D$,$ A

C$.D,A,B,C$

D$.$ A$,$ D$,$ B$,$ C