Which of the following file formats contain exclusively the sound file format suitable for distribution across the Internet?
A. AVI
B. MIDI
C. WMV
D. WMA
E. MP4
Choose the correct answer from the options given below:
B & D only
The question asks which formats are exclusively audio (sound) formats, suitable for distributing sound alone over the internet, as opposed to formats that carry video (with or without audio).
AVI (Audio Video Interleave) (A) is a container format that holds both video and audio streams together, so it is not an audio-only format.
MIDI (Musical Instrument Digital Interface) (B) stores instructions for producing music/sound (notes, timing, instrument data) rather than video, so it is a pure audio format.
WMV (Windows Media Video) (C) is Microsoft's video container format, carrying both video and audio, so it is not audio-only.
WMA (Windows Media Audio) (D) is Microsoft's compressed audio format, designed specifically to store and stream sound over networks including the internet, so it is a pure audio format.
MP4 (E) is a general multimedia container that most commonly carries video along with audio, so it is fundamentally a video/multimedia container rather than an audio-exclusive format.
Since only MIDI and WMA are dedicated, audio-only file formats, the correct answer is B and D only.
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