Look at the time-series data listed on the Excel document titled "Demand for Product Alpha". You want to generate forecast for the monthly demand of product Alpha using: [A] the 2-period moving average method {B] the 4-period moving average method [C] the 5-period moving average method. [D] the 7 period moving average method. You must use at least 4 decimal places in your calculation and answer. Answer the following questions: The value of MAD is The value of MAPE is The value of RMSE is units. percent. units. W NA The actual demands for product Alpha in the past 15 months are shown below. Month Actual Demand (u) 1 75 2 70 3 139 4 132 5 83 6 88 7 129 8 118 9 132 10 115 11 77 12 92 13 128 14 136 15 127