Write down a unit vector in XY plane, making an angle of 30 degress with the positive direction of $x$ axis.

Question

$\begin{array}{1 1} (A) \large-\frac{\sqrt3}{2}\hat i+\large\frac{1}{2}\hat j\\ (B) \large\frac{\sqrt3}{2}\hat i-\large\frac{1}{2}\hat j \\ (C) \large\frac{\sqrt3}{2}\hat i+\large\frac{1}{2}\hat j\\ (D) \large-\frac{\sqrt3}{2}\hat i-\large\frac{1}{2}\hat j \end{array} $