What is the purpose of a holdout set? Part 2 A. A holdout set is data that are atypical and therefore held out of forecast model building since they would cause a forecasting model to not fit most of the (typical) data. B. A holdout set is data that cannot be obtained for reasons beyond the forecaster's control. C. A holdout set is one or more forecasting coefficients that are used only when data fall within a predetermined range. D. A holdout set is used to verify the accuracy of a forecast technique