In the circuit shown below, if the source voltage $V_S=100 \: \angle$ $53.13^{\circ}$ V then the Thevenin’s equivalent voltage in Volts as seen by the load resistance $R_L$ is

- $100\angle 90^{\circ}$
- $800\angle 0^{\circ}$
- $800\angle 90^{\circ}$
- $100\angle 60^{\circ}$