CompTIA Has Created a Six-Step Process for Troubleshooting

CompTIA has created a six-step process for troubleshooting. The first step in the process is to identify the problem. Which of the followings steps resembles the next step in the methodology?

A) Establish a theory of probable cause.
B) Document findings, actions, and outcomes.
C) Test the theory to determine the cause.
D) Establish a plan of action to resolve the problem and implement the solution.