Kurt, a user, cannot access any network resources. The technician has determined that the problem
is isolated to Kurt, and that there have not been any changes to his workstation or switch port
recently. Which of the following steps in the troubleshooting methodology should the technician do
NEXT?

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

B.
Implement preventative measures.

C.
Implement the solution or escalate as necessary.

D.
Establish a theory of probable cause.