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Which of the following is not a primary storage device?

  • A.Magnetic tape
  • B.Magnetic disk
  • C.Optical disk
  • D.All of the above

Answer: D

Correct answer: All of the above

Primary storage is the memory the processor addresses directly - RAM and ROM. Magnetic tape, magnetic disk and optical disk are all secondary storage: they hold data outside the processor's address space and must be read into memory before use. So none of the three is primary, and the answer covers all of them.

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