Question: Which is NOT a reason why finding structured data on the Web is difficult? Websites may use tables to format unstructured data. Heuristics and other

Which is NOT a reason why finding structured data on the Web is difficult?
Websites may use tables to format unstructured data.
Heuristics and other signals are needed to inform ranking of data.
There is very little structured data on the Web.
Relationships modeled by a table are difficult to discover.

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