1. Buffer
  2. Backing storage
  3. PROM
  4. Accumulator
  5. None of the above

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Answer: Option 2

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 thumb drives and memory sticks.

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