Calculate the [Y]Bus matrix of the given two bus systems.
1
\(\begin{bmatrix} \frac{Y}{a^2} & \frac{-Y}{a}\\ \frac{-Y}{a} & \frac{Y}{a^2} \end{bmatrix}\:\)
2
\(\begin{bmatrix} \frac{Y}{a^2} & \frac{-Y}{a}\\ \frac{-Y}{a} & -Y \end{bmatrix}\:\)
3
\(\begin{bmatrix} \frac{Y}{a} & \frac{-Y}{a^2}\\ \frac{-Y}{a^2} & \frac{Y}{a} \end{bmatrix}\:\)
4
\(\begin{bmatrix} \frac{Y}{a^2} & \frac{-Y}{a}\\ \frac{-Y}{a} & Y \end{bmatrix}\:\)