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Which of the following BEST defines add-on security?
Correct Answer: D
Explanation/Reference: Explanation: Add-on security is defined as "Security protection mechanisms that are hardware or software retrofitted to a system to increase that system's protection level." Incorrect Answers: A: Add-on security can be physical security (hardware) but it is often software as well. B: An add-on is something 'added' to an existing system; it is not an integral part of a system. C: Add-on security can be a layer of security. However, layered security does not refer specifically to security add-ons.