For the system shown below, $S_{D1}$ and $S_{D2}$ are complex power demands at bus $1$ and bus $2$ respectively. If $\mid V_2 \mid =1$ pu, the VAR rating of the capacitor $(Q_{G2})$ connected at bus $2$ is
1. $0.2$ pu
2. $0.268$ pu
3. $0.312$ pu
4. $0.4$ pu