When moving from a source document to a new document, what is a common way to derive new classifications?

The correct choice is based on the understanding of how new classifications are derived from existing information. Extension involves taking information from a source document and elaborating on it or applying it to a new context, which may result in a new classification level. This process requires a careful assessment of the original content and its implications, particularly in determining whether the security classification changes due to the broader application or additional details included in the new document.

In the context of derivative classification, extension often means that you are building on the existing classified material while still adhering to its classification guidelines. This makes it important to recognize the significance of the original classification and how it might morph as more context is added through the new document.

While summarization, analysis, and disclosure are relevant processes, they do not emphasize the same aspect of expanding or adapting the classification in the manner that extension does. Summarization involves condensing information, analysis is about examining the information in depth, and disclosure focuses on sharing or revealing classified information. None of these processes directly derive new classifications in the same way extension does.