Which of the following describes the practice of stateful multi-layer inspection?

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Which of the following describes the practice of stateful multi-layer inspection?
A . Using a VLAN on a firewall to enable masquerading of private IP addresses
B . Prioritizing voice and video data to reduce congestion
C . Inspecting packets in all layers of the OSI/RM with a packet filter
D . Using Quality of Service (QoS) on a proxy-oriented firewall

Answer: C