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Which of the following statement(s) is/are true? 

  1. If an $\text{LTI}$ system is causal, it is stable
  2. A discrete time $\text{LTI}$ system is causal if and only if its response to a step input $u[n]$
    is $0$ for $n<0$
  3. If a discrete time $\text{LTI}$ system has an impulse response $h[n]$ of finite duration the system is stable 
  4. If the impulse response $0<|h[n]|<1$ for all $n$, then the $\text{LTI}$ system is stable. 

     

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