I was doing some work for someone in Ai (a quick change on a large banner sign). The logo and design needed minor changes and he asked that I send him the vector based print files and the native files. I know photoshop but I am a little new to Ai, I am not totally clear what he want he wants me to send.
You just try to send him an EPS file, Because it has no loss in quality and therefore is primarily used for images used in printing. And obviously, don't forget to make a Creating Outlines on Text (if there is text in your design).