In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y...

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In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y - Y₁-1 = μ+₁Y₁-1 +0₁E₁-1 + Et O b. Y - Y₁-1= μ+₁(Y₁-1 - Y₁-2) +0-1+ t O c. Y₁-Y₁-1=+₁(Y₁-1 - Yt-2) +0₁ (Yt-2 - Yt-3) + Et O d. Y - Y₁-1 = μ + $₁Y₁-1 + 0₁(Yt-1 - Yt-2) + In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y - Y₁-1 = μ+₁Y₁-1 +0₁E₁-1 + Et O b. Y - Y₁-1= μ+₁(Y₁-1 - Y₁-2) +0-1+ t O c. Y₁-Y₁-1=+₁(Y₁-1 - Yt-2) +0₁ (Yt-2 - Yt-3) + Et O d. Y - Y₁-1 = μ + $₁Y₁-1 + 0₁(Yt-1 - Yt-2) +

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