Which of the statements concerning proxy firewalls is correct?

Proxy firewalls introduce processing overhead for connection handling and content inspection, which typically reduces network speed rather than increasing it.

Proxy firewalls centralize application traffic through a single control point, not decentralize it, which is a core architectural feature of the proxy model.

Blocking packets from passing to and from a protected network describes a packet-filtering firewall, not a proxy firewall, which instead terminates and re-initiates connections.

A proxy firewall operates at the application layer by accepting an inbound connection from a client, inspecting the request, and then initiating a brand-new outbound connection to the target server. This two-connection model means the client never communicates directly with the destination, allowing deep inspection and access control at the application layer.