The domain of the function $f(x) = \sqrt{\cos x}$ is
- A$[0, \frac{\pi}{2}]$
- B$[0, \frac{\pi}{2}] \cup [\frac{3\pi}{2}, 2\pi]$
- C$[\frac{3\pi}{2}, 2\pi]$
- D$[-\frac{\pi}{2}, \frac{\pi}{2}]$
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