how should special types of incidents, such as redundant power supply failure, be handled?

According to the ITIL v3 framework, how should special types of incidents, such as redundant power supply failure, be handled?

A.
Treat the incident as an outage and fallow the appropriate process.

B.
Treat the incident as an operational issue and follow the appropriate process.

C.
Treat the incident as a service issue and use the appropriate escalation guidelines.

D.
Treat the incident as a critical issue and trigger management escalation.