The 2-part network of Fig. has open circuit impedance parameters given by matrix.
1
\(\left[\begin{array}{ll}R & R \\ R & R\end{array}\right]\)
2
\(\left[\begin{array}{ll}R & O \\ O & R\end{array}\right]\)
3
\(\left[\begin{array}{ll}\infty & R \\ R & \infty\end{array}\right]\)
4
\(\left[\begin{array}{ll}R & \infty \\ \infty & \mathrm{R}\end{array}\right]\)