1,) Which of the following statements is true?

A) The mean squared error is influenced much more by large forecast errors than is the mean absolute error.

B) Forecast errors should be summed to judge the goodness of a forecasting model.

C) One measure of the accuracy of a forecasting model is the seasonal index.

D) In situations where you need to compare forecasting methods for different time periods, relative measures such as mean absolute error (MAE) are preferred.