(A) SQL databases
SQL databases are commonly used for storing tabular data sets in Data Science, as they organise data in rows and columns for efficient querying and analysis.
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The source passage (Orange Data Mining chapter) mentions that the File widget in Orange loads data from CSV, Excel, and SQL formats — confirming SQL databases as a standard storage format for tabular data. NumPy is a Python library (not a storage format), HTML is for web pages, and JSON stores non-tabular/nested data. Examiners expect you to simply identify option (A) with a brief justification.