If $z = \cos \frac{\pi}{6} + i\sin \frac{\pi}{6}$,then:
- A$|z| = 1, \arg z = \frac{\pi}{4}$
- B$|z| = 1, \arg z = \frac{\pi}{6}$
- C$|z| = \frac{\sqrt{3}}{2}, \arg z = \frac{5\pi}{24}$
- D$|z| = \frac{\sqrt{3}}{2}, \arg z = \tan^{-1} \frac{1}{\sqrt{2}}$
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