Consider the following statements about linear time invariant

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Consider the following statements about linear time invariant (LTI) continuous time systems:
1. The output signal in an LTI system with known input and known impulse response can always be determined.
2. A causal LTI system is always stable.
3. A causal LTI system has an impulse response. h(t) which has a finite value when integrated h(t) over
whole of the time axis, i.e., ^{+ ∞} is finite.
_{– ∞}

Which of the statements given above are correct?

1. 1 and 3
2. 1 and 2
3. 2 and 3
4. 1, 2 and 3

Correct Option: D

Since, it is not necessary true that causal system is always stable.
Hence, alternative (D) is the correct choice.