The correct answer is D. diskettes.
A removable disk is a data storage device that can be removed from a computer and stored elsewhere. Removable disks include floppy disks, Zip disks, and USB flash drives.
A fixed disk is a data storage device that is permanently installed in a computer. Fixed disks are also known as hard disks or hard drives.
A mass storage system is a data storage device that can store a large amount of
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