Which of the following statements are true about an application-level gateway? Each correct answer represents a complete

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Which of the following statements are true about an application-level gateway?
Each correct answer represents a complete solution. Choose all that apply.

A. It allows client applications to use dynamic ephemeral TCP/UDP ports to communicate with the known ports used by the server applications.
B. It does not allow customized NAT traversal filters to be plugged into the gateway to support address and port translation for certain application protocols.
C. It is a security component that is added to a firewall or NAT employed in a computer network.
D. It converts the network layer address information found inside an application payload. The hosts can be on either side of the firewall/NAT.