__________ is a structured repository of data, about data.

The correct answer is the one that defines a structured repository of data about data. Let's analyze each option: Option A: Data Flow Diagram (DFD) – This shows how data flows through a system, focusing on processes and data movement. It does not store definitions or metadata about data elements. Hence, it is not a repository of data about data. Option B: System Components Matrix – This lists system components and their relationships. It is used for system design, not for defining data attributes. Therefore, it does not serve as a repository of data about data. Option C: Data Dictionary – This is a structured collection that defines data elements, their types, formats, and relationships. It stores metadata about data, making it a repository of data about data. This matches the question description. Option D: Decision Table – This is used to represent business rules and logic in a tabular format. It does not store data definitions or metadata. Thus, it is not a repository of data about data. Option E: Question not attempted – This indicates no response was given. It is not a valid concept and does not represent a repository of data about data. Therefore, the correct option is the one that defines a structured repository of data about data.