A balanced (positive sequence) three-phase $AC$ voltage source is connected to a balanced, star connected load through a star-delta transformer as shown in the figure. The line-to-line voltage rating is $230$ V on the star side, and $115$ V on the delta side. If the magnetizing current is neglected and $\overline{I}_{s}=100 \angle 0^\circ$ A, then what is the value of $\overline{I}_{p}$ in Ampere?

1. $50\angle 30^\circ$
2. $50\angle- 30^\circ$
3. $50\sqrt{3}\angle 30^\circ$
4. $200\angle 30^\circ$