Final answer:
An incident request refers to reporting a critical system outage.
Step-by-step explanation:
An incident request refers to a specific type of request made to IT support to address an unplanned disruption in normal service.
Out of the options provided, the best description of an incident request is b) Reporting a critical system outage.
This situation involves informing IT of a significant problem in the system that is causing a service outage or disruption.