According to the NEC Style Manual, terms used in more than two articles typically qualify for inclusion in?

The correct choice for this question is Article 100. This article in the National Electrical Code (NEC) is specifically designed to provide definitions for terms that are used throughout the code. Including terms in Article 100 helps ensure consistent understanding and application of these terms across various articles, enhancing clarity and reducing ambiguity in interpretation.

Article 100 serves as a centralized resource for definitions that are applicable in multiple sections of the NEC, which is particularly useful given that many terms are used repeatedly across the different articles pertaining to electrical installations. This structured approach aligns with the NEC Style Manual, which emphasizes the importance of clear communication within electrical regulations.

The other choices refer to different parts of the NEC. While Chapter 10 and Part II may contain relevant content, they do not focus specifically on definitions as laid out in Article 100. Annex A typically includes additional information or examples that support understanding but is not primarily dedicated to definitions in the same way Article 100 is.