The line $A$ to neutral voltage is $10\angle 15^0$  for a balanced three phase star-connected load with phase sequence $ABC$. The voltage of line $B$ with respect to line $C$ is given by
1. $10\sqrt{3}\angle 105^0$
2. $10\angle 105^0$
3. $10\sqrt{3}\angle -75^0$
4. $-10\sqrt{3}\angle 90^0$