Which of the following statements about moving average models is incorrect?

a. Moving average (MA) models are another class of deterministic models that are often used for forecasting.

b. With exponentially weighted moving average (EWMA) models, we can have recent values of y_t be given a greater weight than do earlier values.

c. If the series has an upward trend, EWMA model will overpredict future values of y_t because the model averages past values of y_t to produce a forecast.

d. Moving average forecasts are all "adaptive forecasts" in the sense that they automatically adjust themselves to the most recently available data.