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A single-input single-output feedback system has forward transfer function $G(s)$ and feedback transfer function $H(s)$. It is given that $|G(s)H(s)|< 1$ . Which of the following is true about the stability of the system?

  1. The system is always stable
  2. The system is stable if all zeros of $G(s)H(s)$ are in left half of the s-plane
  3. The system is stable if all poles of $G(s)H(s)$  are in left half of the s-plane
  4. It is not possible to say whether or not the system is stable from the information given
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