Cоnsider the seаsоnаl ARIMA(1,1,1)(1,1,1)[12] mоdel. Whаt is the role of the seasonal differencing parameter (D = 1)? HINT: ARIMA(p, d, q)(P, D, Q)[s] is used to specify Seasonal ARIMA (SARIMA) models, where [s] is the frequency.