Patents protect processes (as well as inventions, new plantlife, and decorative patterns). The other answers listed are answers to other questions.

Fences are physical controls; carpets and ceilings are architectural features, and a door is not necessarily a control: the lock on the door would be a physical security control. Although you might think of a door as a potential answer, the best answer is the fence; the exam will have questions where more than one answer is correct, and the answer that will score you points is the one that is most correct.

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Explanation
Accepted is not a risk acceptance category. The risk acceptance categories are minimal, low, moderate, high, and critical.

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Explanation:
Virtual private networks (VPNs) are commonly used to allow access into trust zones. Via a VPN, access can be controlled and logged and only allowed through secure channels by authorized users. It also adds an additional layer of encryption and protection to communications.