If $f: R \rightarrow R$ is defined by $f(x) = 7 + \cos(5x + 3)$ for $x \in R$,then the period of $f$ is
- A$2\pi$
- B$\pi$
- C$\frac{\pi}{5}$
- D$\frac{2\pi}{5}$
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The correct order as indicated in each option is:
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