In what kind of system would you find the following string of characters used as a rule within its configuration?

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You just set up a security system in your network.

In what kind of system would you find the following string of characters used as a rule within its configuration? alert tcp any any -> 192.168.100.0/24 21 (msg: ““FTP on the network!””;)
A . A firewall IPTable
B . FTP Server rule
C . A Router IPTable
D . An Intrusion Detection System

Answer: D