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MongoDB applies the _________ phase, which collects and condenses the aggregated data.

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MongoDB applies the _________ phase, which collects and condenses the aggregated data.

(a) map

(b) reduce

(c) mapper

(d) all of the mentioned

This question was addressed to me in class test.

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

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Best answer
Right option is (b) reduce

For explanation: MongoDB then stores the results in a collection.

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