Select the Statement Which Best Describes the Application of Observation

Select the statement which best describes the application of observation and analysis procedures when troubleshooting complex circuits.

A) A thorough understanding of the proper operation of the test equipment to be used to analyze the fault.
B) A thorough understanding of the operation of the circuit, observing the symptoms caused by the failure and using human reasoning to isolate the fault to a specific area.
C) The capabilities of modern test equipment have virtually eliminated the requirement for observation and analysis procedures when troubleshooting.