Write a recursive method to compute the binomial coefficient using the definition shown below:

\[
\begin{aligned}
\operatorname{binomial}(n, k)=\{ & \text { if } k=0 \text { or } n=k, \text { then } 1, \\
& \text { otherwise, } \operatorname{binomial}(n-1, k-1)+\operatorname{binomial}(n-1, k)\}
\end{aligned}
\]