What looks for people on the network who shouldn't be there or who are acting suspiciously?

A Encryption
B Public key encryption
C Intrusion‐detection software
D Security‐auditing software

Correct Answer: Intrusion‐detection software

Intrusion‐detection software looks for people on the network who shouldn't be there or who are acting suspiciously. An intrusion detection system is a device or software application that monitors a network or systems for malicious activity or policy violations.
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