For transfer function of a physical two-port network
- A. All zeros must lie only in the left half of the s-plane
- B. All poles may lie anywhere in the s-plane
- C. The poles lying on the imaginary axis must be simple
- D. All the above
Answer: D. All the above
Explanation: For physical realizability and stability of a passive two-port network, transmission poles and zeros must lie in the LHP (or on the jω axis as simple poles), satisfying all these conditions.