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

1. $−j7.0$
2. $−j8.5$
3. $−j7.5$
4. $−j9.0$

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