Answer Posted / Rahul Singh Rathor

MongoDB provides multi-document ACID transactions through the use of WiredTiger or MongoDB 4.0+ with the MongoDB Changelog feature. To perform a transaction, you can use the `beginTransaction`, `savePoint`, and `commitTransaction` methods for WiredTiger, or the `startSession` method with the `beginTransaction` operation for MongoDB 4.0+. Locking is accomplished through collection-level locks in MongoDB.

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