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Structured data refers to highly organized data stored in predefined formats such as rows and columns. Relational databases (Option A): Structured. Data tables (Option B): Structured. CSV files (Option C): Structured because they are tabular with rows and columns. XML (Option D): Not structured but semi-structured because it stores hierarchical information with tags and attributes. Thus, the correct answer is Option D (XML). Reference: DASCA Data Scientist Knowledge Framework (DSKF) - Big Data Fundamentals: Structured vs Semi- structured Data.
