Regarding the difference between packet filtering firewalls and application proxy firewalls, which of the following descriptions is incorrect?

Regarding the difference between packet filtering firewalls and application proxy firewalls, which of the following descriptions is incorrect?
A . Applying proxy firewall can speed up intranet users’ access to commonly used websites.
B . Packet filtering firewalls are usually implemented below the transport layer, and application proxy firewalls are usually implemented above the session layer.
C . Application layer proxy firewall can provide user authentication.
D . Packet filtering firewalls do not have data forwarding capabilities and must be deployed in conjunction with routers.

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Answer: D