Which of the following statements about the firewall technology are true? (Select 3 Answers)
A. The network gateway of the application layer checks application-layer data carried in packets passing through the gateway.
B. The network gateway for session status detection checks session information carried in packets only at the session layer.
C. During packet filtering, the session status is checked and the whole data stream is analyzed.
D. Address proxy replaces IP addresses and port numbers of hosts within the network with the IP address and port number of the proxy device or router.
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