Which one of the following systems is a cuasual system ?

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Which one of the following systems is a cuasual system ?
[y(t) is output and u(t) is a input step function].

1. y(t) = sin [u(t + 3)]
2. y(t) = 5u(t) + 3u(t – 1)
3. y(t) = 5u(t) + 3u(t + 1)
4. y(t) = sin [u(t – 3) + sin [u(t + 3)]

Correct Option: B

NA