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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Answer: D. Unstructured data Reasoning: Open-ended survey responses are unstructured data because they lack a predefined format or schema. Why D is correct: Free-form text: Customers write responses in their own words without constraints No fixed structure: Each response varies in length, format, and content Requires processing: Natural language processing (NLP) is needed to extract meaning and patterns Variable format: Unlike structured data with defined fields and categories
The correct answer is D. Unstructured data. This is because the feedback consists of "natural language"—human speech or writing that doesn't follow a specific, pre-defined format. Unlike numbers or checkboxes, this data is free-form and requires a model to "read" and interpret the context to make sense of it.