A is the correct answer
Incident = UNPLANNED interruption to a service....
Change = addition, modification or removal of anything that could have direct or indirect effect on services
I would debate a C here...
The phrasing is "the service WILL BE unavailable" not IS unavailable. The service is up, but will need future maintenance to keep on going. In this case, there would rather be an emergency change with a scheduled downtime which offers some 'planned' leeway on when the services are going to be unreachable...
You are correct to point out the distinction in verb tense. If the service "will be" unavailable, it implies a planned event rather than an ongoing incident. In this case, the practice involved in managing the situation would indeed be:
C. Change enablement.
Change enablement deals with managing changes to services, including both planned and unplanned changes. Unplanned maintenance, if properly managed, would involve change enablement processes to ensure that the maintenance activities are carried out effectively and with minimal disruption to service availability. Therefore, in the context of the scenario provided, change enablement would be the most appropriate practice.
Although 'in the next two hours' states that the service is already down, which constitutes an A :D Still, an emergency change might be arranged in the next few minutes :P
A: Incident management
5.2.5 Incident Management: "Definition: Incident - An unplanned interruption to a service or reduction in the quality of a service."
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