Relational database table and Delimited spreadsheet file are correct.

A Relational database table organizes data into rows and columns with a fixed schema and defined data types for each field. This fixed schema and tabular layout make it easy to query the data with SQL and enforce constraints so it is a canonical example of structured data.

A Delimited spreadsheet file such as a CSV uses a consistent column layout and delimiters so each column maps to a specific field across rows. When the columns are well defined it can be loaded into databases and treated as structured data.

An Cloud Storage object is simply a file stored in object storage and it does not imply any internal schema. Objects in Cloud Storage can contain structured, semi structured, or unstructured data so the storage object itself is not inherently structured.

A JSON document is typically considered semi structured because it allows nested structures and varying fields across records. That flexibility is useful, but it means JSON does not have the fixed tabular schema that defines structured data in the classical sense.

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