Suppose $I_{A},\:I_{B}$ and $I_{C}$ are a set of unbalanced current phasors in a three-phase system. The phase-$B$ zero-sequence current $I_{B0}=0.1\angle 0^{\circ}$ $p.u$. If phase-$A$ current $I_{A}=1.1\angle 0^{\circ}$ $p.u$ and phase-$C$ current $I_{C}=\left ( 1\angle 120^{\circ}+0.1 \right )$ $p.u$, then $I_{B}$ in $p.u$ is
- $1\angle 240^{\circ}-0.1\angle 0^{\circ}$
- $1.1\angle 240^{\circ}-0.1\angle 0^{\circ}$
- $1.1\angle -120^{\circ}+0.1\angle 0^{\circ}$
- $1\angle -120^{\circ}+0.1\angle 0^{\circ}$