Which of the following statement(s) is/are true?
- If an $\text{LTI}$ system is causal, it is stable
- A discrete time $\text{LTI}$ system is causal if and only if its response to a step input $u[n]$
is $0$ for $n<0$
- If a discrete time $\text{LTI}$ system has an impulse response $h[n]$ of finite duration the system is stable
- If the impulse response $0<|h[n]|<1$ for all $n$, then the $\text{LTI}$ system is stable.