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Which is LEAST likely to interfere with upgrading to a newer DOS version?

  • A.ROM BIOS
  • B.Video controlle
  • C.Compressed drives
  • D.Existing backup files

Answer: B

Correct answer: Video controller

A DOS upgrade touches the BIOS interface, the disk structures and the existing files, so all three of those can obstruct it. The video controller is addressed the same way by every version, so it is the least likely to interfere.

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