Q.

A signal is anti-causal if                              

A. x(t) = 0 for t = 0
B. x(t) = 1 for t < 0
C. x(t) = 1 for t > 0
D. x(t) = 0 for t > 0
Answer» D. x(t) = 0 for t > 0
Explanation: a signal is said to be anti- causal when x(t) = 0 for t > 0.
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