A particle travels along a unit circle and stops at $\large\frac{7 \pi}{6}$ radius. What will be the coordinate at that point ?

Question

$\begin{array}{1 1} (a)\;(\large\frac{\sqrt 3}{2},\frac{1}{2}) \\ (b)\;(\large\frac{-\sqrt 3}{2},\frac{1}{2}) \\ (c)\;(\large\frac{\sqrt 3}{2},\frac{-1}{2}) \\ (d)\;(\large\frac{-\sqrt 3}{2},\frac{-1}{2}) \end{array} $