6. DFG Clocks has the following demand history for the past six months: (15 points) Demand 67 Month January February 82 March 95 April 97 May 90 June July 88 a. Using the Nave model, create forecasts for April, May, June, and July using the data above. Then determine the MAD and MAPE for April, May, and June. b. Using a three-month moving average, create the forecasts for April, May, June, and July. Then determine the MAD and MAPE for April, May, and June. c. Using the MAD and MAPE as the error performance measures, compare the performance of each model. Which model do you think is the best for the July forecast? What will the July forecast be