48. Any storage device added to a computer beyond the immediately usable main storage is known as A.Floppy disk B.Hard disk C.Backing store D.Punched card E.None of the above
Option C Solution: Backing store : The term backing storage refers to any non-volatile data storage that will retain a computer's data even after the computer is powered off. Common types of backing storage devices are hard drives, SSD, external hard disk drives, optical media such as CD or DVD, and flash media such as thumbdrives and memory sticks.
