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_________ can return the results of a map-reduce operation as a document, or may write the results to collections.

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_________ can return the results of a map-reduce operation as a document, or may write the results to collections.

(a) mapReduce

(b) mapperRed

(c) RedMap

(d) none of the mentioned

The question was asked in an online interview.

I would like to ask this question from Map-Reduce in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
The correct option is (a) mapReduce

The best explanation: Map-reduce operations take the documents of a single collection as the input and can perform any arbitrary sorting and limiting before beginning the map stage.

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