Intrusion detection systems can be all of the following types EXCEPT:

A.
Signature-based.
B.
Statistical anomaly-based.
C.
Network-based.
D.
Defined-based.
Explanation:
The correct answer is Defined-based. All the other answers are types of IDSs.
Knowledge-based (Signature-based) IDS and behavior-based (Anomaly-based) IDS
Network Intrusion detection systems (NIDS) and Host Intrusion detection systems (HIDS)
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