Which of the following types of firewalls increases the security of data packets by remembering the state of connection at the network and the session layers as they pass through the filter

Which of the following types of firewalls increases the security of data packets by remembering the state of connection at the network and the session layers as they pass through the filter
A . Stateless packet filter firewall
B . PIX firewall
C . Stateful packet filter firewall
D . Virtual firewall

Answer: C