Structured data is correct.

Structured data refers to information organized into a fixed schema such as tables with columns that enforce data types and allowed values. A relational SQL database uses this model so reporting and searching are straightforward because queries can rely on predictable fields and constraints.

Semi structured data is incorrect because it uses flexible or self describing formats such as JSON or XML where fields can vary between records and strict column types and constraints are not enforced.

Sensitive data is incorrect because that term describes the confidentiality or risk classification of information rather than its format or schema. A table can contain sensitive data but the question asks about the data structure.

Unstructured data is incorrect because it denotes free form content like text documents, images, or audio that lack a predefined schema and therefore do not use typed, column based organization.

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