Final answer:
The correct file system type used for optical media is CDFS.
Step-by-step explanation:
The correct answer is C. CDFS.
When it comes to optical media, such as CDs and DVDs, the file system type used is the Compact Disc File System (CDFS). CDFS is specifically designed for read-only optical discs, and it allows the disc to store and organize files and directories in a way that can be read by CD/DVD drives.
For example, if you were to create a data CD with files and folders and then insert it into a CD/DVD drive on your computer, the drive would read the file system of the disc, which is CDFS, to access and display the files and directories.