CD-ROM– contains MP3 files (which are more condensed versions of audio files) you can play on a computer, and the individual MP3s can be downloaded and uploaded to a portable listening device (like an iPod)
Audio CD – contains larger files of each recording and can only be played on an audio CD player
Online Audio Streaming – only available when connected to the Internet
Handout – a single PDF file that is a representation of the materials provided