Which of the following AWS services can serve as a migration target for an on-premises MySQL database?

Choosing Amazon RDS (Relational Database Service) as a migration target for an on-premises MySQL database is indeed the most appropriate choice. Amazon RDS is designed specifically for relational databases and supports several database engines, including MySQL. It provides a managed service that automatically handles tasks like backups, scaling, patching, and replication, making it easier to migrate and operate a MySQL database in the cloud without needing to manage the underlying infrastructure directly.

Other services like Amazon S3, Amazon DynamoDB, and Amazon Redshift serve different purposes and are not direct replacements for a traditional relational database like MySQL. Amazon S3 is primarily an object storage service and does not host databases. While DynamoDB is a NoSQL database service that can handle large volumes of data, it doesn't support the relational data model that MySQL uses. Lastly, Amazon Redshift is a data warehouse solution optimized for analytical processing rather than transactional databases, making it unsuitable for direct use as a migration target for MySQL. Therefore, RDS stands out as the most fitting option for this migration scenario.