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$I_1,\; I_2\: and \:I_3$ in the figure below are mesh currents. The correct set of mesh equations for these currents, in matrix form, is ____________

  1. $\begin{bmatrix} 3&-1&-2\\-1&3&-1\\-2&-1&3 \end{bmatrix} \begin{bmatrix}I_1\\I_2\\I_3\end{bmatrix}= \begin{bmatrix}V_1\\V_2\\-V_3\end{bmatrix}$
  2. $\begin{bmatrix} 3&-1&-2\\-1&3&-1\\-2&-1&-3 \end{bmatrix} \begin{bmatrix}I_1\\I_2\\I_3\end{bmatrix}= \begin{bmatrix}V_1\\V_2\\V_3\end{bmatrix}$
  3. $\begin{bmatrix} -3&-1&-2\\-1&3&-1\\-2&-1&3 \end{bmatrix} \begin{bmatrix}I_1\\I_2\\I_3\end{bmatrix}= \begin{bmatrix}V_1\\V_2\\-V_3\end{bmatrix}$
  4. $\begin{bmatrix} 1&-1&-2\\-1&2&-1\\-2&-1&3 \end{bmatrix} \begin{bmatrix}I_1\\I_2\\I_3\end{bmatrix}= \begin{bmatrix}V_1\\V_2\\V_3\end{bmatrix}$
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