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Which unit holds data permanently?
Input unit
Secondary storage unit
Output Unit
Primary Memory Unit
Answer: (b) Secondary storage unit
Secondary storage is used to hold data and programs when the computer is not in use.
Common types of secondary storage
Secondary storage devices are generally separated into three types:
magnetic storage devices, such as hard disk drives
optical storage devices, such as CD, DVD and Blu-ray discs
solid state storage devices, such as solid state drives and USB memory sticks
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