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A firewall can be used as a packet filter. It can forward or block packets based on the information in the network layer and transport layer headers: source and destination IP addresses, source and destination port addresses, and type of protocol (TCP or UDP). A packet-filter firewall is a router that uses a filtering table to decide which packets must be discarded (not forwarded).

Hence,Option(C)Packet filter firewall.

Reference :http://mvn.edu.in/lms/mod/book/view.php?id=86

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