A company plans to migrate thousands of on-premises servers (Linux and Windows), SAN storage, Java and PHP apps (MySQL), and Oracle databases to AWS. The environment includes many dependent services, and existing documentation is incomplete and out of date. A solutions architect must discover the current environment, understand network and application dependencies, and estimate post-migration cloud costs. Which tools or services should the architect use to plan the migration? (Choose three.)

AWS Application Discovery Service helps discover on-premises servers, their configurations, performance data, and dependencies, which is crucial for understanding the existing environment and planning the migration of thousands of servers. AWS Cloud Adoption Readiness Tool (CART) assesses an organization's readiness for cloud adoption across various perspectives, including business, process, people, and platform, and helps estimate costs, which is vital given the incomplete documentation and need for cost estimation. AWS Migration Hub provides a single location to track the progress of application migrations across multiple AWS and partner solutions, offering a comprehensive view of the migration status. AWS SMS (Server Migration Service) is used for migrating servers, not for discovery or planning. AWS X-Ray is for analyzing and debugging distributed applications, not for initial discovery or cost estimation. Amazon Inspector is a security assessment service, not a migration planning tool.