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If the ______ field for mapReduce has the sharded value, MongoDB shards the output collection using the _id field as the shard key.

If the ______ field for mapReduce has the sharded value, MongoDB shards the output collection using the _id field as the shard key. Correct Answer $out

During the post-processing, each shard will pull the results for its own chunks from the other shards, run the final reduce/finalize, and write locally to the output collection.

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