The $ABCD$ parameters of the following $2$-port network are
- $\begin{bmatrix}3.5 + j2 & 20.5 \\ 20.5 & 3.5-j2 \end{bmatrix} \\$
- $\begin{bmatrix}3.5 +j2 & 30.5 \\ 0.5&3.5-j2 \end{bmatrix} \\$
- $\begin{bmatrix}10 &2+j0 \\2+j0 &10 \end{bmatrix} \\$
- $\begin{bmatrix}7+j4 &0.5 \\ 30.5&7-j4 \end{bmatrix} $