Find the principal solutions of the equation $\sin x = \frac{\sqrt{3}}{2}$.
- A$\frac{\pi}{3}$ and $\frac{2\pi}{3}$
- B$\frac{\pi}{6}$ and $\frac{5\pi}{6}$
- C$\frac{\pi}{4}$ and $\frac{3\pi}{4}$
- D$\frac{2\pi}{3}$ and $\frac{4\pi}{3}$
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