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Three of the following are preventive controls. Which is the odd one out?

  • A.an audit log of control plane activity
  • B.a policy that denies public access
  • C.multi-factor authentication on the account
  • D.a security group restricting inbound traffic

Answer: A

The audit log is detective, recording what happened rather than stopping it. The other three each block an action before it takes effect, which is the defining property of a preventive control. A mature design carries both kinds, since neither alone answers every question.

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