A. hardware - हार्डवेयर
B. Software - सॉफ्टवेयर
C. Storage - स्टोरेज
D. All - सब
A Compact Disc, also called a CD are small plastic discs which store and retrieve computer data or music using light. Compact Discs replaced floppy disks because they were faster and could hold more information. The CDs made floppy disks become obsolete.