A company needs to migrate a 50 TB database to AWS with minimal downtime. Which service facilitates this?

Correct answer: AWS Database Migration Service

Option B is correct because AWS Database Migration Service (DMS) is purpose-built to migrate databases to AWS with minimal downtime by continuously replicating changes from the source to the target during the migration window, making it the ideal choice for a live 50 TB database that must stay available. Option A, AWS Snowball, is a physical data transfer device suited for large offline bulk transfers where network bandwidth is insufficient, but it does not provide continuous replication and therefore cannot minimize downtime for a live database. Option C, AWS Transfer Family, provides managed SFTP, FTPS, and FTP endpoints for file transfers and is not designed for relational or NoSQL database migrations. Option D, AWS DataSync, is an online data transfer service for file system and object storage migrations, not for database-level migrations requiring schema conversion or transaction-consistent replication.