Regarding the description of an intrusion detection system, which of the following is incorrect?

Regarding the description of an intrusion detection system, which of the following is incorrect?
A . The intrusion detection system can dynamically collect a large amount of key information through the network and computer, and can analyze and judge the current status of the entire system environment in a timely manner.
B . Once the intrusion detection system discovers behavior that violates security policies or there are traces of the system being attacked, it can implement blocking operations.
C . Intrusion detection system includes all software and hardware systems used for intrusion detection
D . The intrusion detection system can be linked with firewalls and switches to become a powerful "assistant" of the firewall to better and more accurately control traffic access between domains.

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Answer: B