Answer:
d. intrusion detection system
Step-by-step explanation:
An intrusion detection system is a device or software for the violations of the policy or any malicious activity
Now in the given situation it is mentioned that the system that checks the use of the network for the hacking attempt and takes the prevention steps to block and raise the additional alarm in order to warn the security persons
So this represent the intrusion detection system
Hence, the correct option is d.