A project team did not perform UAT User Acceptance Tests this time on a deliverable because it worked fine in many previous tests, but it failed to run in the final release to production. What should the project manager do to identify the reason for failure?

A. Have an audit of the whole process.

B. Check the quality metrics document.

C. Create a scatter diagram to understand correlation.

D. Organize a Fishbone ‘why-why’ root cause analysis.