Which one of the following statements is correct? LTI syste

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M: +2.00/-0.66

Which one of the following statements is correct?
LTI system is causal

[ESE (IES) EE 2017 (Technical)]

A If and only if its impulse response is nonzero for negative values of n.

B If and only if its impulse response is nonzero for positive values of n.

C If its impulse response is zero for negative values of n.

D If its impulse response is zero for positive values of n.