Naming an internal (private) Active Directory LAN ?

What is preferred/accepted method for naming conventions on a private AD LAN? Is it or company.lan/.local/.internal?
We have an external domain,, but I don't want that to get confused with our internal DNS, would it be best to use company.lan ?
Suggestions? What do you use?

Please help

I didn't find the right solution from the internet.

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Thank you

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