The quarterly sales at ABC Electronics Bookstore is as follows: Q1 = 138,000 Q2 = 130,000 Q3 = 147,000 Q4 = 141,000 Q5 = 144,000 Q6 = 142,000 Q7 = 165,000 Q8 = 173,000 Forecast the sales for Q9 using: a) SES with alpha = 0.04 b) WMA with 45% of the previous month's sales and 55% of the last 2 months' sales. c) LTA d) Which is the best forecasting method