Final answer:
The books and manuals in a troubleshooter's library are considered part of their knowledge base as they provide valuable reference points and contribute to problem-solving.
Step-by-step explanation:
Are the books and manuals in a troubleshooter's personal or professional library considered part of his or her knowledge base? The answer is A. Yes. The resources that a troubleshooter has in their personal or professional library, such as books, manuals, and documentation, are indeed part of their broader knowledge base.
These materials provide valuable reference points and in-depth information that can be drawn upon when diagnosing and solving problems. While these resources are separate from the troubleshooter's internalized knowledge or practical experience, they complement personal expertise by offering detailed insights and procedural guides that are directly accessible when needed.