Question: A filter with H(z) = a) True b) False (z^2 + 4z+1)/(z^2 + 4); with ROC |Z| < 2 is causal.

A filter with H(z) = a) True b) False (z^2 + 4z+1)/(z^2 + 4); with ROC |Z| < 2 is causal. 

A filter with H(z) = a) True b) False (z^2 + 4z+1)/(z^2 + 4); with ROC |Z| < 2 is causal.

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