How is a proxy policy different from a packet filter policy?

How is a proxy policy different from a packet filter policy? (Select two.)
A. Only a proxy policy examines information in the IP header.
B. Only a proxy policy uses the IP source, destination, and port to control network traffic.
C. Only a proxy policy can prevent specific threats without blocking the entire connection.
D. Only a proxy works at the application, network, and transport layers to examine all connection data.

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