An entity-relationship diagram is used for modeling organizational data requirements and uses specific symbols to represent data entities, relationships, and attributes.

• A. A diagrammatic notation for modeling data requirements with symbols for entities, relationships, and attributes.
• B. A data storage technology used for operational databases.
• C. A programming language for database queries.
• D. A hardware specification for network topology.

Answer: (A)

An entity-relationship diagram is a diagrammatic notation used to model organizational data requirements, and it uses symbols to represent data entities, relationships, and attributes. This description fits ERDs because they visually map what data items exist (entities), how those items are connected (relationships), and what details describe them (attributes). The approach is about modeling data requirements, not about storage technologies, programming languages, or hardware specifications, which is why the other options don’t apply.