What type of data does the MTP allow to be transferred, aside from music files?

The MTP, or Media Transfer Protocol, is designed specifically for transferring media files between devices, typically for digital media players and portable devices. It enables the movement of various types of media content, such as images, videos, and indeed, music files. The focus of MTP is on files that are media-related, which includes any format that can be categorized as a media file. Therefore, the correct choice acknowledges that MTP facilitates the transfer of media files on portable media players, encompassing a broader range of file types beyond just music.

Other options may suggest data types that do not align with the specific functionality of the MTP, such as executable programs or database files, which typically fall under different protocols or methods of transfer more suited for their specific requirements.