What defines a set of sources for a topic profile to examine?

The concept of a "Source Group" is crucial in examining a specific topic profile, as it encompasses a defined collection of sources related to that topic. By grouping related sources together, a Source Group enables efficient analysis and monitoring of content or conversations that pertain to a particular subject matter. This organization helps in simplifying the research process, allowing for focused insights and data gathering from the selected sources.

In this context, the other options do not fulfill the same role. A Source Catalog generally serves as a broader inventory of all available sources rather than providing a defined set for a specific examination. A Content List may detail various materials or posts but lacks the structural organization that a Source Group provides focused on topic analysis. A Data Stream usually refers to the flow of data for analysis rather than the selection and categorization of sources for a specific investigation, making it less applicable here. Thus, the Source Group stands out as the most relevant and accurate choice for this question.