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time series Let Yt = Yt-1 + et - 7et-1 + 10.68et-2 + 5.144et-3 + 0.544et-4, where B = -5 is a repeated root of

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Let Yt = Yt-1 + et - 7et-1 + 10.68et-2 + 5.144et-3 + 0.544et-4, where B = -5 is a repeated root of the MA polynomial. This model is A. Stationary and invertible B. Non-stationary and non-invertible C. Stationary and non-invertible O D. Non-stationary and invertible

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