Multiple choice

For the two-port network shown below, the short circuit admittance parameter matrix is

^{$\left[
\begin{array}
\ 4 & -2 \\\\
-2 & 4
\end{array}
\right]
$}S
^{$\left[
\begin{array}
\ 1 & -0.5 \\\\
-0.5 & 1
\end{array}
\right]
$}S
^{$\left[
\begin{array}
\ 1 & 0.5 \\\\
0.5 & 1
\end{array}
\right]
$}S
^{$\left[
\begin{array}
\ 4 & 2 \\\\
2 & 4
\end{array}
\right]
$}S

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