Which Intrusion Detection System (IDS) usually produces the most false alarms due to the unpredictable behaviors of users and networks?

Which Intrusion Detection System (IDS) usually produces the most false alarms due to the unpredictable behaviors of users and networks?
A . network-based IDS systems (NIDS)
B . host-based IDS systems (HIDS)
C . anomaly detection
D . signature recognition

Answer: B