You should just try one of each

2.0 is two channel. Try AC3 2.0 first as your player should be able to play that. Almost all new DVDs are using AC3 sound and then you can choose between 5.1 or 2.0 (7.1 is slowly starting)

Muxing is multiplexing. has to do with interlacing. The same thing actually I guess.

If you don't have a video interlazed then there will be a seperate audio track and no sound on the video file