Which one of the following statements about forecasting is true? a. casual methods are used when historical data are available and the relationship between the factor to be forecast and other external and internal factors cannot be identified. b. judgment methods are particularly appropriate for situations in which historical data are lacking. c. the five basic patterns of demand are the horizontal, trend, seasonal, cyclical, and the subjective judgment of forecasters. d. focused forecasting is a technique that focuses on one particular component of demand and develops a forecast from it.