If you have different movie or audio file types saved to your computer and your computer can only play the OGG format instead of the MP4 video format, what should you do?

convert the MP4 format file to the OGG format file                  

Explanation:        

An OGG file is a compressed audio file of Ogg Vorbis that is used for holding audio data. It is a free and an open container file format which is maintained by Xiph.Org Foundation. OGG format file can multiplex independent streams of video, text, audio and meta data.

The OGG file has better sound quality and characteristics than a MP3 or MP4 files. The MP4 file format can be converted into OGG format file if the files are saved in different formats in the computer which can play only OGG format.

c. would be your answer.

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