The company is preparing to migrate to AWS and needs detailed information about its on-premises servers, applications, and usage patterns, but does not want to replicate workloads to AWS yet. Which AWS service or tool should they use?

AWS Application Discovery Service is the correct choice because it helps gather detailed information about on-premises environments, including server specifications, application dependencies, and resource utilization, without migrating any workloads. This data is crucial for planning a migration. AWS Application Migration Service (MGN) is incorrect because it is used for rehosting (lift-and-shift) applications to AWS, which involves replicating workloads. Cloud Migration Factory is incorrect as it's a solution that leverages AWS services for large-scale migrations, but not a standalone discovery service. AWS Transfer Family is incorrect because it provides fully managed support for file transfers (SFTP, FTPS, FTP) into and out of Amazon S3 or Amazon EFS, not for discovery.