Where does a kubectl exec request land in kubelet?

Hello everyone! I have a question specific to Linux.
I need some help with the source code. I’ve been following the codepath for kubectl exec command and I’m getting lost (or getting stuck in a loop) due to many levels of interfaces in handling of the request (Which I assume is implemented in this way for a good reason). Will someone be able to point me to the source file/function where rubber meets the road… where the final “exec” of “Command ” happens?

Thank you!