a) Make your forecast for "Year 6" by using two-ahead moving average method b) Make your forecast for "Year Z"by using exponential smoothing (Hint: you should find the optimal value of before starting your solution, format of 0,X (one digit after coma) will be enough) c) Make your forecast for "Year 7 " by using Holt's method (=0,15& use same that you obtained in previous section) d) Make your forecast for "Year Z"by using Winter's method ( =0,15& use same that you obtained in previous section) c) Draw a single diagram to show your original data and four different forecasted values separately and make your comments