Which of the following actions takes place during the problem identification phase?

Documenting the findings is an ongoing process throughout troubleshooting, but primarily occurs after significant steps or solutions have been attempted or found, not solely in problem identification.

Duplicating the issue is a critical step in the problem identification phase as it confirms the problem exists, helps to gather more information about its symptoms, and allows the technician to observe the problem firsthand. This action provides concrete evidence of the issue.

Establishing a theory of probable cause comes after identifying and gathering information about the problem, using the gathered data to hypothesize its root.

Questioning the obvious is a general mindset for troubleshooting but not a distinct action within a specific phase like duplicating the issue.