Questions 2. What is the name of the process defined by (1 + 0.6B)(1 - B)at = (1 - 0.9B4)Wt (A) ARIMA(2,0,0) x (0,0,2) 4 (B) ARIMA(1, 1,0) x (0,0,2) 4 (C) ARIMA(2,0,0) x (0,0, 1) 4 (D) ARIMA(1, 1,0) x (0,0, 1) 4