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Which of the following types of firewalls ensures that the packets are part of the established session?
Correct Answer: A
Explanation/Reference: A stateful firewall is a network firewall that tracks the operating state and characteristics of network connections traversing it. The firewall is configured to distinguish legitimate packets for different types of connections. Only packets matching a known active connection (session) are allowed to pass the firewall. References: https://en.wikipedia.org/wiki/Stateful_firewall