How does MongoDB manage versions of documents?

MongoDB manages versions of documents primarily by allowing multiple versions to exist through the use of timestamp fields. This approach enables the storage of different versions of a document, providing the capability to track changes over time. Each version can have its own creation timestamp, allowing applications to query or retrieve the state of the document at various points in time.

This versioning system is particularly useful for applications requiring audit trails or the ability to revert to previous data states. By utilizing timestamp fields, developers can efficiently manage and access historical data without losing any information.

The other methods, such as overwriting documents, grouping versions into a single document, or automatically deleting previous versions, do not align with the fundamental capabilities and structure that MongoDB offers. Instead, they would limit the ability to retain historical data or create a complex data management scenario that does not leverage MongoDB's strengths in handling dynamic and scalable document data.