Ok, I understand that. But when you say E&P, completion belongs to E or P?

I'm asking that because I had a discussion with my mastering teacher and he said that its in scope of production department of a company. I know that there is a team that is responsible only for completion, but if you have to define it to drilling or production, I would choose drilling. Even so, in general, the same rig that drill a well usually does the completion. Do you agree with me?