How does the `TotalSegments` parameter in a 'Parallel Scan' ensure consistent data retrieval without reading the same items twice across threads?

1. A It uses a global distributed lock on the table for each thread's segment.
2. B Logical Partitioning: DynamoDB uses a deterministic hashing algorithm to divide the entire key-space into N logical segments. Each thread is assigned a specific `Segment` ID (0 to N-1), ensuring that worker threads operate on mutually exclusive subsets of the data.
3. C Threads coordinate via a shared Amazon SQS queue that tracks scanned metadata.
4. D AWS automatically manages the threads and merges the results in a temporary S3 bucket.