The competition between stateful inspection and proxies was based on performance, protocol support, and security. Considering stateful Inspections and Proxies, which statement is correct?

The competition between stateful inspection and proxies was based on performance, protocol support, and security. Considering stateful Inspections and Proxies, which statement is correct?
A . Stateful Inspection is limited to Layer 3 visibility, with no Layer 4 to Layer 7 visibility capabilities.
B . When it comes to performance, proxies were significantly faster than stateful inspection firewalls.
C . Proxies offer far more security because of being able to give visibility of the payload (the data).
D . When it comes to performance, stateful inspection was significantly faster than proxies.

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Answer: D