\begin{tabular}{|l|l|}
\hline Q.27 & Which of the following statement(s) is/are true? \\
\hline
- & If an LTI system is causal, it is stable \\
\hline - & $\begin{array}{l}\text { A discrete time LTI system is causal if and only if its response to a step input } u[n] \\
\text { is } 0 \text { for } n<0\end{array}$ \\<br />
\hline - & $\begin{array}{l}\text { If a discrete time LTI system has an impulse response } h[n] \text { of finite duration the } \\
\text { system is stable }\end{array}$ \\
\hline - & If the impulse response $0<|h[n]|<1$ for all $n$, then the LTI system is stable. \\<br />
\hline
\end{tabular}