Which of the following is a feature of an intrusion detection system (IDS)?

 A feature of an intrusion detection system (IDS) is automated response. This is because an IDS is a system that monitors network or system activities for malicious or anomalous behavior, and alerts or reports on any detected incidents. An IDS can also perform automated response actions, such as blocking traffic, terminating sessions, or sending notifications, to contain or mitigate the incidents. The other options are not features of an IDS, but rather different concepts or techniques that are related to intrusion detection or prevention, such as intrusion prevention (A), interface with firewalls C, or back doors into applications (D).