We are interested in trying out the single exponential smoothing method for forecasting product sales. What information would we need at a minimum in order to make the forecast? Pick the best answer from the options below: this month's actual sales and forecasted sales and an average alpha smoothing constant for our industry the last 24 months forecasted sales and 24 months actual sales and an average alpha smoothing constant for our industry the last 3 months sales this month's forecasted sales and an average alpha smoothing constant for our industry