After a patch of an enterprise server, applications were unable to load. The server administrator was able to resolve the issue. Which of the following is the next step the administrator should take?

Test the theory to determine the cause is a step earlier in the troubleshooting process, performed before the issue is resolved.

Documenting findings, actions, and outcomes is the final step in many troubleshooting methodologies, ensuring that the problem and its solution are recorded for future learning, auditing, and problem prevention.

Establish a plan of action is also an earlier step, occurring after identifying a probable cause but before implementing a solution.

Verify full system functionality should be performed immediately after implementing a solution to ensure the fix worked and did not introduce new issues, but documentation is the subsequent and final step in the overall process.