A customer’s system is infected with a virus. The technician removes the virus and updates the antivirus definitions. Which of the following steps of the troubleshooting process has the technician performed?

A.
Document findings, actions, and outcomes.

B.
Establish a plan of action to resolve the problem.

C.
Verify full system functionality and implement preventative measures.

D.
Test the theory to determine the cause of the problem.