The weighted moving average forecast for the fifth period, with weights of 0.15 for period 1, 0.20 for period 2, 0.25 for period 3, and 0.40 for period 4, using the demand data shown below isPeriod Demand 1 3,500 2 3,800 3 3,500 4 4,000a. 3,760b. 3,700c. 3,650d. 3,325