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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