IT senior management is concerned that IT service levels consistently fall below those outlined in...

 According to the CGEIT exam guide, a root cause analysis (RCA) is a systematic process of identifying and analyzing the factors that cause an undesirable event or condition. It helps to determine the underlying causes of problems and issues, and to prevent their recurrence. A root cause analysis is the best way to enable the CIO to build a corrective action plan, as it provides a clear understanding of the reasons why IT service levels consistently fall below those outlined in the SLA, and suggests possible solutions and improvements. The other options are not sufficient to build a corrective action plan, as they do not address the root causes of the SLA failure. References: CGEIT Exam Candidate Guide, page 15. CGEIT Certification, Root Cause Analysis