Find the value of $\cos 30^{\circ}+\sin 30^{\circ}$

Question

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