Sara is having a tough time finding the cause of a problem on a computer she is troubleshooting. She found a possible problem but is not sure if she is correct. In case she is wrong, Sara does not want to test her theory, because doing so might worsen the problem. What would you advise Sara to do?

a. Research the problem on the Internet.

b. Test her theory.

c. Take a guess about what the problem might be.

d. Tell her customer she can't fix the problem.