An administrator has implemented a solution to resolve a server’s problem in which the server unexpectedly reboots.  Which of the following should be the administrator’s NEXT troubleshooting step？（）

A.Test the theory to determine if the solution will correct the issue， list all other possible causes.
B.Verify full system functionality.
C.Document the issue； include details regarding findings， actions taken to resolve the issue， and the outcome.
D.Establish a theory of probable cause based on previous tests and determine next steps toresolve