Which of the following statements is (are) true? Group of answer choices a. Ensemble forecasts are often shown by using spaghetti plots. b. A "forecast based on weather types" is a forecasting technique that produces several versions of a forecast model, each beginning with slightly different weather information to reflect errors in the measurements. c. A prog is a chart that interprets the current state of the atmosphere. d. Any forecast that uses computer technology is called numerical weather prediction. e. All of the above