Schema definition describes:

Schema definition describes:

• A. Representation of a plan or theory in the form of an outline or model
• B. A numeric value for aggregation
• C. Billing account identifier
• D. The currency used

Answer: (B)

A schema is the blueprint for how data is organized. It defines the structure of the data: what entities exist, what attributes they have, the data types, and how those pieces relate to each other. That’s why the description that fits best is a representation of a plan or theory in the form of an outline or model—it's describing the organized structure or model for data, not the actual values themselves. It isn’t a numeric value used for aggregation, nor an identifier like a billing account number, nor a currency value; those are specific data items that would populate the structure defined by the schema.

A schema is the blueprint for how data is organized. It defines the structure of the data: what entities exist, what attributes they have, the data types, and how those pieces relate to each other. That’s why the description that fits best is a representation of a plan or theory in the form of an outline or model—it's describing the organized structure or model for data, not the actual values themselves. It isn’t a numeric value used for aggregation, nor an identifier like a billing account number, nor a currency value; those are specific data items that would populate the structure defined by the schema.