Your manager is trying to determine what forecasting method to use. Based upon the following historical data, calculate the following forecast and specify what procedure you would utilize. $$ Month Actual Demand $45678910656768717376787880841285$ a$.$ Calculate the simple three$-$month moving average forecast for periods $4$ to $12.$ b$.$ Calculate the weighted three$-$month moving average using weights of $0\mathrm{.}50,0\mathrm{.}30,$ and $0\mathrm{.}20$ for periods $4$ to $12.$ c$.$ Calculate the