In a three-bus power system, the voltage of the second bus is about \(\left(1.2 \angle 0^{\circ}ight) p . u\), and the network impedance matrix is as follows. If an inductor with the reactance of \(2.7 p . u\). is connected to the second bus, determine the voltage variation of the third bus:

\[
\left[\mathrm{Z}_{\text {Bus }}ight]=j\left[\begin{array}{ccc}
0.2 & 0.15 & 0.1 \\
0.15 & 0.3 & 0.15 \\
0.1 & 0.15 & 0.25
\end{array}ight] \text { p.u. }
\]

1) 0.075 p.и.

2) 0.06 p.u.

3) 0.12 p.u.

4) 0.15 p.u.