Final test: Server security

One correct answer

fail2ban is running, the service journal is full of Failed password, yet fail2ban-client status sshd shows Total failed 0 and Journal matches: _SYSTEMD_UNIT=sshd.service, though the service is named differently. Why 0?

• A The jail reads the journal of the wrong service and sees no refusals.
• B The sshd filter cannot parse the Failed password line.
• C The attacker's address is not in ignoreip, so the jail lets it through.