Consider the sales data for Computer Success given inProblem $7.$a$.$ Use a $3-$month weighted moving average to forecastthe sales for the months April through December.Use weights of $(4/8),(3/8),$ and $(1/8),$ giving moreweight to more recent data.b$.$ Use exponential smoothing with a $=0\mathrm{.}6$ to forecastthe sales for the months April through December.Assume that the initial forecast for January was$$3,200.$ Start error measurement in April.c$.$ Compare the performance of the two methods byusing the mean absolute deviation as the perfor$-$mance criterion, with error measurement beginningin April. Which method would you recommend?d$.$ Compare the performance of the two methods byusing the mean absolute percent error as the perfor$-$mance criterion, with error measurement beginningin April. Which method would you recommend?e$.$ Compare the performance of the two methods byusing the mean squared error as the performance cri$-$terion, with error measurement beginning in April.Which method would you recommend