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Firewall is a type of ____________.

  • A.Virus
  • B.
    Security threat
  • C.Worm
  • D.
    None of the above

Answer: D

Correct answer: None of the above

A firewall is a protective measure, not a threat: it filters connections to and from a machine. It is neither a virus, nor a worm, nor a security threat of any kind, so none of the three categories fits.

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