If function $f$ is continuous at point $x = \pi$ and $f(x) = \begin{cases} kx+1; & x \leq \pi \\ \cos x; & x > \pi \end{cases}$ then the value of $k$ is $\dots \dots \dots$
- A$\frac{1}{\pi}$
- B$\frac{1}{2}$
- C$-\frac{2}{\pi}$
- D$0$
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