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A 3-bus power system network consists of 3 transmission lines. The bus admittance matrix of the uncompensated system is

$\begin{bmatrix}

-j6 &j3 &j4 \\

j3&-j7 &j5 \\

j4& j5 & -j8

\end{bmatrix}$ pu.

If the shunt capacitance of all transmission lines is $50$% compensated, the imaginary part of the $3^{rd}$ row $3^{rd}$ column element (in pu) of the bus admittance matrix after compensation is

- $−j7.0$
- $−j8.5$
- $−j7.5$
- $−j9.0$

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