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4.A non-stationary time series with no significant ACF or PACF may be modelled by a)ARIMA (0, 1, 0) b)ARIMA (0, 0, 0) c)ARIMA (0, k,

4.A non-stationary time series with no significant ACF or PACF may be modelled by

a)ARIMA (0, 1, 0)

b)ARIMA (0, 0, 0)

c)ARIMA (0, k, 0), where k is the order of differencing to make the series stationary

d)ARIMA (1, 1, 1)

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