What can be the coordinates of a points on a unit circle at an angle of $\large\frac{5 \pi}{6}$

Question

$\begin{array}{1 1} (a)\;\bigg(\large\frac{-\sqrt 3}{2},\frac{1}{2} \bigg)\\ (b)\;\bigg(\large\frac{\sqrt 3}{2},\frac{-1}{2} \bigg)\\ (c)\;\bigg(\large\frac{-\sqrt 3}{4},\frac{1}{2} \bigg)\\ (d)\;\bigg(\large\frac{-\sqrt 3}{2},\frac{1}{7} \bigg) \end{array}$