If $f(x) = \begin{cases} mx+1, & x \leq \frac{\pi}{2} \\ \sin x+n, & x > \frac{\pi}{2} \end{cases}$ is continuous at $x = \frac{\pi}{2}$,where $m, n \in \mathbb{Z}$,then:

  • A
    $m=1, n=0$
  • B
    $m=\frac{n \pi}{2}$
  • C
    $m=n=\frac{\pi}{2}$
  • D
    $n=m\frac{\pi}{2} + 1 - 1 = m\frac{\pi}{2}$

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