A is incorrect: An Analyzer processes text for indexing and querying (e.g., tokenization, stemming), but it doesn't map enriched fields from a skillset.

B is incorrect: A Synonym Map enhances search by associating terms with similar meanings, not by mapping data fields from skillsets to an index.

C is incorrect: A Datasource connects the indexer to the raw data, but it doesn't map enriched fields from a skillset to the index.

D is correct: The Indexer's Output Field Mappings section is where you explicitly define the correspondence between the data fields generated or enriched by a skillset and the specific fields in your search index.