Which is a secondary memory device?

CPU
ALU
Floppy disk
Mouse
None of the above
Floppy disk  Floppy Disk : A floppy disk, also known as a floppy, diskette, or simply disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles. Floppy disks are read and written by a floppy disk drive (FDD).
Source : wikipedia.org

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