Final answer:
The correct file system type for optical media is D. CDFS (Compact Disc File System), which is associated with the ISO 9660 standard and used for CDs, DVDs, and Blu-ray discs.
Step-by-step explanation:
The file system type used primarily for optical media is CDFS, which stands for Compact Disc File System. It is associated with the ISO 9660 standard and is commonly used for CDs, DVDs, and Blu-ray discs. The other file systems listed, such as FAT32, NTFS, and HPFS, have different uses.
FAT32 is often used for flash drives and other external storage devices, NTFS is the standard file system for Windows operating systems, and HPFS was used by the OS/2 operating system. Therefore, the correct answer to which of the following file system types is used primarily for optical media is D. CDFS.