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A two-port network shown below is excited by external $dc$ sources. The voltages and the currents are measured with voltmeters $\mathrm{V}_{1}, \mathrm{~V}_{2}$ and ammeters $\mathrm{A}_{1}, \mathrm{~A}_{2}$ (all assumed to be ideal), as indicated. Under following switch conditions, the readings obtained are:
1. $\mathrm{S}_{1}$ - Open, $\mathrm{S}_{2}$ - Closed $\mathrm{A}_{1}=0 \mathrm{~A}, \mathrm{~V}_{1}=4.5 \mathrm{~V}, \mathrm{~V}_{2}=1.5 \mathrm{~V}, \mathrm{~A}_{2}=1 \mathrm{~A}$
2. $\mathrm{S}_{1}-$ Closed, $\mathrm{S}_{2}$ - Open $\mathrm{A}_{1}=4 \mathrm{~A}, \mathrm{~V}_{1}=6 \mathrm{~V}, \mathrm{~V}_{2}=6 \mathrm{~V}, \mathrm{~A}_{2}=0 \mathrm{~A}$
1. $\left[\begin{array}{cc}-3 & 3 \\ -1 & 0.67\end{array}\right]$
2. $\left[\begin{array}{cc}-3 & -1 \\ 3 & 0.67\end{array}\right]$
3. $\left[\begin{array}{cc}3 & 3 \\ 1 & 0.67\end{array}\right]$
4. $\left[\begin{array}{cc}3 & 1 \\ -3 & -0.67\end{array}\right]$