The file P$12\_46.$xlsx contains monthly time series data for total U$.$S$.$ retail sales of building materials, garden equipment, and supplies dealers.a$.$Is seasonality present in these data? If so$,$ characterize the seasonality pattern.b$.$Use the Deseasonalize option in StatTools to forecast the deseasonalized data for each month of the next year using the moving average method with an appro$-$priate span.c$.$Does Holt$$s exponential smoothing method, with optimal smoothing constants, outperform the mov$-$ing average method employed in part b$?$ Demonstrate why or why not