The suggested answer is D.
When the incident management team is unable to determine the root cause of an incident, the error-correction activity should be transferred to the Problem Management team. Incident Management primarily deals with restoring normal service operation as quickly as possible; when root cause analysis and error correction are required, it is generally within the purview of Problem Management to handle these tasks. Problem Management specializes in investigating and diagnosing the underlying cause of incidents to prevent future occurrences.