When a discrete time LTI system is said to be causal?

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answerhappygod
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When a discrete time LTI system is said to be causal?

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a) Output y[n] must not depend on x[k] for k>n
b) Output y[n] must not depend on x[k] for k=n
c) Output y[n] must not depend on x[k] for k<n
d) Output y[n] must depend on x[k] for k>n
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