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Question:

Which of the following project management documents records challenges, problems, realized risks, and opportunities?  

A Lessons learned register 
Explaination

The lessons learned register, created out of the Manage Project Knowledge process, records information about situations that have occurred within the project, including recording challenges, problems, realized risks and opportunities, and other information relevant for future reference. While “project documents” is a technically accurate answer, “lessons learned register” is a more specific answer.