Which of the following statement is NOT TRUE for a continuous time causal and stable $LTI$ system?
1. All the poles of the system must lie on the left side of $j\omega$ axis
2. Zeros of the system can lie anywhere in the $s$ – plane
3. All the poles must lie within $\mid s\mid=1$
4. All the roots of the characteristic equation must be located on the left side of $j\omega$ axis