Which network firewall operates up to Layer 4 (Transport layer) of the OSI model and maintains information about the communication sessions which have been established between hosts on trusted and untrusted networks?

Which network firewall operates up to Layer 4 (Transport layer) of the OSI model and maintains information about the communication sessions which have been established between hosts on trusted and untrusted networks?
A . Group policy
B . Stateless
C . Stateful
D . Static packet-filter

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Answer: C