Q. 9 The input and output of a continuous time system are respectively denoted by x(t) and y(t). Which of the following descriptions corresponds to a causal system ?
(A) y(t) = x(t – 2) + x(t + 4)
(B) y(t) = (t – 4)x(t + 1)
(C) y(t) = (t + 4)x(t – 1)
(D) y(t) = (t + 5)x(t + 5)
Answer: C
Explanation:
