Given the following data, according to MSE which is the most accurate forecasting technique---the nave forecast, the two-period moving average forecast, the weighted moving average forecast with weights of .5, .3, & .2, respectively, or the exponential smoothing forecast with a = .2? Month Demand 1 19 2 20 3 18 4 19 5 17 nave forecast two-period moving average forecast exponentially smoothed forecast with a = .2 O weighted moving average forecast with weights of .5, .3, &.2