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For the two-port network shown in the figure, the impedance (Z) matrix (in $\Omega$) is

1. $\begin{bmatrix} 6 & 24 \\ 42 & 9 \end{bmatrix}$
2. $\begin{bmatrix} 9 & 8 \\ 8 & 24 \end{bmatrix}$
3. $\begin{bmatrix} 9 & 6 \\ 6 & 24 \end{bmatrix}$
4. $\begin{bmatrix} 42 & 6 \\ 6 & 60 \end{bmatrix}$