A technician has established a plan of action.

After a technician has established a plan of action, the next step in the troubleshooting process is to implement the solution. This involves executing the plan that was carefully crafted to resolve the issue. Following this, the technician would then verify system functionality and take preventive measures if necessary, but implementation comes immediately after planning.

A. Verify system functionality occurs after the solution has been implemented.

B. Identify preventive measures happens towards the end, after the problem is resolved.

C. Document the findings is part of the final step, which takes place after verifying functionality and preventive measures.

References:

CompTIA A+ Certification Exam Guide

Official CompTIA Troubleshooting Methodology