A

\[\left[ \frac{\pi}{3}; \frac{4\pi }{3}\right]\]

B

\[\left[ \frac{\pi}{3} + 2k\pi; 2k\pi + \frac{4\pi}{3}\right];k \in \mathbb{Z}\]

C

\[\left[ \frac{\pi}{3} + 2k\pi;2k\pi + \frac{5\pi}{3}\right]; k \in \mathbb{Z}\]

D

\[\left[ k\pi + \frac{\pi}{3}; k\pi + \frac{4\pi}{3}\right]; k \in \mathbb{Z}\]

E

\[\left[ \frac{\pi}{6} + 2k\pi; 2k\pi + \frac{5\pi}{6}\right]; k \in \mathbb{Z}\]