If $\cos \theta = \frac{-1}{2}$ and $0^o < \theta < 360^o$,then the values of $\theta$ are
- A$120^o$ and $300^o$
- B$60^o$ and $120^o$
- C$120^o$ and $240^o$
- D$60^o$ and $240^o$
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