Which of the following best describes the type of data found in traditional relational databases?

Structured data is data that is organized in a fixed format, typically in tables with rows and columns, where each column has a defined data type and relationships are established between tables. This perfectly describes the data stored in traditional relational databases like MySQL, PostgreSQL, or SQL Server.

Unstructured data lacks a predefined format or organization, such as text documents, images, or videos, and is not natively stored in relational databases.

Semi-structured data has some organizational properties but does not conform to the rigid tabular structure of relational databases, examples include JSON or XML files.

Free-form data is a colloquial term for unstructured data, indicating no specific format or organization, and is not a standard type of data stored in traditional relational databases.