Which two statements about stateful firewalls in an enterprise network are true?

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Question:
Which two statements about stateful firewalls in an enterprise network are true?

They can use information about previous packets to make decisions about future packets.
They are most effective when placed in front of the router connected to the Internet.
They are more susceptible to DoS attacks than stateless firewalls.
They can track the number of active TCP connections.
They can filter HTTP and HTTPS traffic in the inbound direction only.