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MongoDB achieves replication by the use of ___

37. MongoDB achieves replication by the use of ___.

1. Replica set
2. Data set
3. $first
4. All of the mentioned above

Answer: A) Replica set

Explanation:

Replication in MongoDB is accomplished through the use of replica sets. A replica set is a collection of mongod instances that are all hosting the same data set at the same time. In a replica, one node is designated as the primary node, and it is responsible for receiving all write operations.