The help desk's escalation at 8:55 a.m. was just an alert, not a formal recognition of the issue as an incident. The actual detection—when the organization officially recognized the situation as an incident—occurred at 9:10 a.m., when the CISO declared it an incident.
I believe the answer is B for the same reasons as others have listed. Also the question says "team" and the IRT is the one that declared it to be an actual issue
The help desk doesn't detect the incident. Logically or physically the IR team does. Just like an IDS detecting an intrusion. The help desk team is not equipped with IR know-how or tools. They don't know if it's an actual incident.
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