 
			 
			MCQOPTIONS
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				| 1. | An LTI system is said to be causal if and only if | 
| A. | Impulse response is non-zero for positive values of n | 
| B. | Impulse response is zero for positive values of n | 
| C. | Impulse response is non-zero for negative values of n | 
| D. | Impulse response is zero for negative values of n | 
| Answer» E. | |