About firewalls and IDS, which of the following is true?

About firewalls and IDS, which of the following is true?
A . Firewall is a bypass device for fine-grained detection
B . IDS is a straight-path device and can’t perform depth detection
C . Firewall is unable to detect insider malicious operation or misoperation
D . IDS can’t interact with the firewall

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Answer: C