You are only required to bring one set of copies but I advise my clients to bring two copies in separate document holders in case something should happen. For the NDR, it does not have to be notarized.

I cannot stress this enough. Your paperwork is a representation of who you are as a professional pilot. Make it look outstanding. Your job as an applicant is to make the recruiters job as simple as possible. Poor paperwork sets a bad tone in the beginning.