The SAS $$Walmart$\_$montly$\_22$ dataset contains the monthly sales for a Walmart store. Redirect your SAS output to an

$$RTF$$ file and use the following methods to forecast the monthly sales for Department $22$ for $6$ months.

$$ Exponential Smoothing

$$ Double Exponential Smoothing

$$ Multi$-$seasonal $($MULTSEASONAL$)$

Which method is the best? Why?