What concept is indicated when classified information is derived from an authorized source and included in a new document?

The concept indicated when classified information is derived from an authorized source and included in a new document is best captured by the term "Contained in." This is because when classified information from an authorized source is included in a new document, it means that the new document holds that information internally. This clearly shows that the classified information is integral to the content of the new document.

The other choices create confusion in this context. For instance, "Classified by Association" suggests a classification based on the relationship of information rather than direct inclusion or derivation. "Revealed by" implies that information is made known, focusing more on disclosure than containment. "Derived from Analysis" may refer to analytical processes rather than the direct inclusion of classified content from an authorized source.

Thus, the choice that accurately reflects the inclusion of classified information in a new document is "Contained in," as it succinctly captures the notion of something being part of or included within a larger framework.