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The $z$-parameter matrix $\begin{bmatrix} z_{11} &z_{12}\\ z_{21} &z_{22} \end{bmatrix}$ for the two-port network shown is

1. $\begin{bmatrix} 2 &-2\\-2 &2 \end{bmatrix} \\$
2. $\begin{bmatrix} 2 &2\\2 &2 \end{bmatrix} \\$
3. $\begin{bmatrix} 9 &-3\\6 &9 \end{bmatrix} \\$
4. $\begin{bmatrix} 9 &3\\6 &9 \end{bmatrix}$