Point out the wrong statement.(a) If the output collection does not exist, MongoDB creates and shards the collection on the _id field(b) Map-reduce supports operations on sharded collections, both as an input and as an output(c) mongos dispatches, in parallel, a map-reduce post-processing job to every shard that owns a chunk(d) None of the mentionedThe question was asked in an online quiz.I'm obligated to ask this question of Map-Reduce and Sharded Collections in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

Point out the wrong statement.(a) If the output collection does not ex

1.	Point out the wrong statement.(a) If the output collection does not exist, MongoDB creates and shards the collection on the _id field(b) Map-reduce supports operations on sharded collections, both as an input and as an output(c) mongos dispatches, in parallel, a map-reduce post-processing job to every shard that owns a chunk(d) None of the mentionedThe question was asked in an online quiz.I'm obligated to ask this question of Map-Reduce and Sharded Collections in portion Aggregation Concepts and Aggregation Mechanics of MongoDB
Answer» Right ANSWER is (d) None of the mentioned The explanation: When using sharded collection as the input for a map-reduce OPERATION, mongos will automatically dispatch the map-reduce JOB to each shard in parallel.

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