Answer: Delta tables are stored in a collection of files that contain data, history, metadata, and other attributes.

## Explanation Delta tables use a storage organization where data is stored in Parquet files, and metadata is stored in JSON files in the `_delta_log` directory. This creates a collection of files that work together to provide ACID transactions, time travel, and other Delta Lake features. **Key points about Delta table storage:** 1. **Data files**: Stored as Parquet files containing the actual table data 2. **Transaction log**: Stored as JSON files in the `_delta_log` directory, containing: - Metadata about the table schema - Transaction history - File statistics - Version information 3. **Checkpoint files**: Periodic snapshots of the transaction log for faster access **Why other options are incorrect:** - **A**: Incorrect - Delta tables are not stored in a single file; they use multiple files - **B**: Incorrect - Data is not stored in a single file; it's distributed across multiple Parquet files - **D**: Incorrect - The collection of files includes more than just data; it includes metadata and transaction logs - **E**: Incorrect - Delta tables are not single files and contain more than just data This distributed file organization enables Delta Lake's key features like ACID transactions, scalable metadata handling, and efficient time travel capabilities.

Author: Keng Suppaseth