Find the values of $k$ so that the function $f$ is continuous at the indicated point in $f(x) = \left\{ \begin{array} {1 1} kx+1 ,& \quad\text{ if $ x $ \(\leq \pi\)}\\ \cos x,& \quad \text{if $x$ > \(\pi\)}\\ \end{array} \right.$ at $x = \pi$

Question

$\begin{array}{1 1}k= \large\frac{3}{\pi} \\ k= \large\frac{-2}{\pi} \\ k= \large\frac{2}{\pi} \\ k= \large\frac{-1}{\pi} \end{array}$