17. Which of the following descriptions is/are correct about forecasting?
(A) A Naive forecasting methodis done without considering any historical data；
(B) When a positive trend exists, the forecasting usingmoving average method tends to underestimate the true values.
(C) In a simple exponential smoothingmethod, a higher smoothing factor increases the level of smoothing, making the forecast lessresponsive to recent changes.
(D) By treating time as the independent variable and the time series as adependent variable, regression analysis can be used as a time series method.
(E) Time seriesdecomposition can be used to separate or decompose a time series into seasonal, trend, and irregular(error) components.