If $\sec^2 \theta = \frac{4}{3}$,then the general value of $\theta$ is
- A$2n\pi \pm \frac{\pi}{6}$
- B$n\pi \pm \frac{\pi}{6}$
- C$2n\pi \pm \frac{\pi}{3}$
- D$n\pi \pm \frac{\pi}{3}$
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