What situation will generate a true negative IPS alarm type?

What situation will generate a true negative IPS alarm type?

• a verified security incident that is detected
• normal traffic that is correctly being ignored and forwarded
• normal traffic that generates a false alarm
• a known attack that is not detected
  

  Answers Explanation & Hints: The true negative alarm type is used when normal network traffic flows through an interface. Normal traffic should not, and does not generate an actual alarm. A true negative indicates that benign normal traffic is correctly being ignored and forwarded without generating an alert.