1. The transfer function of a discrete time LTI system is given byConsider the following statements:S1: The system is stable and causal for ROC: |z| > 1/2S2: The system is stable but not causal for ROC: |z| < 1/4S3: The system is neither stable nor causal for ROC: 1/4 < |z| < 1/2Which one of the following statements is valid?
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