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Explanation/Reference: Explanation: Application layer firewall works at the application layer, which is layer 7 in the OSI model. Incorrect Answers: B: Application layer firewalls do not work at OSI layer 6, the presentation layer. They are at the Application layer, layer 7. C: Application layer firewalls do not work at OSI layer 5, the session layer. They are at the Application layer, layer 7. D: Application layer firewalls do not work at OSI layer 4, the session layer. They are at the Transport layer, layer 7. References: https://en.wikipedia.org/wiki/Application_firewall