The 2 - part network of Fig A has open circuit impedance parameters given by matrix

A

$$\begin{bmatrix}R & R \\R & R \end{bmatrix}$$

B

$$\begin{bmatrix}R & 0 \\0 & R \end{bmatrix}$$

C

$$\begin{bmatrix}\infty & R \\R & \infty \end{bmatrix}$$

D

$$\begin{bmatrix}R & \infty \\\infty & R \end{bmatrix}$$