Answer: Enables querying data as it existed at any previous point in time, ideal for auditing changes.

The correct answer is B. Delta Lake's time travel feature in Databricks allows users to query data as it was at any specific point in time, making it invaluable for auditing changes. This functionality provides the ability to access and analyze historical versions of data without the need for manual snapshots or backups. It operates by tracking all modifications to the data, enabling queries at various versions or timestamps. This is especially useful for monitoring changes, troubleshooting, and maintaining data integrity. Option A is incorrect because the time travel feature does not automatically transfer old data to a cheaper storage account in Azure; its focus is on querying past data states. Option C is also incorrect as the feature does not require manual snapshot creation in Azure Data Lake Storage; it handles data versioning internally. Option D is misleading because, although the feature can be used to roll back transactions in cases of data corruption, its main purpose is to facilitate the querying of historical data for auditing and analytical purposes.

Author: LeetQuiz Editorial Team