What type of software monitors networks or systems for malicious activities or policy violations?

What type of software monitors networks or systems for malicious activities or policy violations?

• Anti-malware
• Antivirus
• Intrusion detection system
• Home security system 

EXPLANATION

Intrusion Detection Systems

 An intrusion detection system is a device or software application that monitors network or system activities for malicious activities or policy violations and produces reports to a management station.

An intrusion detection system is a device or software application that monitors a network or systems for malicious activity or policy violations. Any malicious activity or violation is typically reported either to an administrator or collected centrally using a security information and event management system. A SIEM system combines outputs from multiple sources, and uses alarm filtering techniques to distinguish malicious activity from false alarms.