The table below shows the result after fitting by ARIMA model.EstimateSig.Constant15029.1110.004ARLag 10.9730.000Lag 2-0.1690.206Based on the above results, answer the following.(i)write the equation for the above ARIMA model.(ii)determine whether model in part (i) is stationary.(iii)(iv)perform the forecasts for periods 5 and 6 if period 4 is the forecast origin. Giventhe first four observations are Y1 = 11610, Y2 = 8970, Y3 = 6380, and Y4 = 6610.Can we simplify the ARIMA model in part (i)? Justify your answer.