Which of the following best describes a stateful inspection?

Question $32$ options:

Offers secure connectivity between many entities and uses encryption to provide an effective defense against sniffing.

Determines the legitimacy of traffic based on the state of the connection from which the traffic originated.

Designed to sit between a host and a web server and communicate with the server on behalf of the host.

Allows all internal traffic to share a single public IP address when connecting to an outside entity.