Question: Question 3 Many firewalls that exist today are still based on the very first type that simply permitted or denied packets based upon a set

Question 3
Many firewalls that exist today are still based on the very first type that simply permitted or denied packets based upon a set of rules. What is this firewall called?
Stateful firewalls
Proxy server firewalls
Packet-filtering
Application-layer firewalls

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