You have a quarterly data series ACFs and the first four autocorrelation are significantly different

You have a quarterly data series ACFs and the first four autocorrelation are significantly different from zero while the subsequent autocorrelations decreases slowly toward zero. In addition the autocorrelations for lag 8, 12 and 16 are significantly different from zero. What are your data autoregressive characteristics?(Points : 3.5) trend and cycle trend and seasonality only cycle only seasonality non linearity

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