Consider the data below and forecast for September: a) Using linear regression b) Using 5-period moving average c) Using exponential smoothing. Alpha is 0.2 and forecast for March was 19. d) Using a nave method e) Which forecasting method is preferred? Use MAD. {:[" Given the following data "],[" Month "," Sales (1000) "],[" Feb ",19],[" Mar ",18],[" Apr ",15],[" May ",20],[" Jun ",18],[" Jul ",22],[" Aug ",20]:}