ACSM Certified Personal Trainer (#101)

Which of the following BEST describes a 'Major Incident'?

An Incident that is so complex that the Service Desk takes longer than five times the normal time to log it
An Incident which requires a large number of people to resolve
An Incident which has a high impact on the business
An Incident that is so complex that it requires root cause analysis before any workaround can be found