What is an approach for integrating a database into an IBM Watson solution?

What is an approach for integrating a database into an IBM Watson solution?
A . Use the Discovery service to search through candidate queries and surface the ones most relevant to the user input.
B . Use the Document Conversion service to search the database for the entries with the strongest relationship to the user input.
C . Use the intent from the Natural Language Classifier as part of a query.
D . Use the concepts from Natural Language Understanding to search the database for the most relevant documents.

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Answer: D