Because you have a small budget, you choose low-cost music you can license. You’ve received permission from a music publisher to use the songs the fitness instructors selected. The publisher sent the song files in a variety of file formats. The instructors will stream the music from an iPhone using wireless speakers as they teach the kids the choreography. In order to create the workout videos they’ll need a file format that works on an iPhone. Which file format should you choose when sending music files to the fitness instructors to create the videos?