With fail2ban, what is a ‘jail’?

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With fail2ban, what is a ‘jail’?
A . A netfilter rules chain blocking offending IP addresses for a particular service
B . A group of services on the server which should be monitored for similar attack patterns in the log files
C . A filter definition and a set of one or more actions to take when the filter is matched
D . The chroot environment in which fail2ban runs

Answer: C