Which statement regarding component-level testing is true?

The statement that component-level testing focuses on individual parts rather than the entire system is accurate because this testing method is designed specifically to assess the performance and functionality of single components in isolation. By evaluating each part separately, technicians can identify faults or issues that may not be apparent when looking at the system as a whole. This targeted approach allows for a more nuanced understanding of how each component contributes to the overall operation of the system.

Other options do not align with the principles of component-level testing. For instance, implying that it is the only method used in troubleshooting ignores the variety of troubleshooting techniques that may be employed, such as system-level testing and diagnostic tools. Furthermore, stating that it is less effective than visual inspection overlooks the advantages of testing individual components, which can provide more definitive results regarding performance. Lastly, the notion that component-level testing is used exclusively for electrical components is inaccurate; this method can also apply to other types of components, such as mechanical parts, depending on the context of the system under evaluation.