Final answer:
The correct answer to the structured data models is 'relational data model'. This model organizes data in tables with rows and columns and is essential for relational databases.
Step-by-step explanation:
Some important structured data models are hierarchical, network and relational data model. The relational data model is a way of organizing data using tables that are associated with each other through shared attributes, which is fundamental to relational databases. This contrasts with hierarchical and network models which organize data in tree structures or more complex graph structures, respectively. The relational model uses a collection of tables to represent both data and the relationships among those data, and each table has multiple columns and each row in a table represents a data set with a unique key identifying each row.