Using the data set below, what would be the forecast for period 4 using a three period moving average: (Choose the closest answer.) Period wN Actual Demand 10,000 12,400 13,250 15,750 20,500 18,500 O a. 12,244 O b. 11,500 O c. 11,883 O d. 14,008 Using the data set below, what would be the forecast for period 5 using a four period weighted moving average? The weights for each period are 0.05, 0.15, 0-30, and 0.50 from the oldest period to the most recent period, respectively. (Choose the closest answer.) Period Actual Demand 10,000 12,400 13,250 14,750 15,220 18,500 O O O O a. 13,105 b. 13,710 c. 14,610 d. 12,820