Which AWS service or feature is an example of a relational database management system?

Explanations:

Amazon Athena is a query service for analyzing data in Amazon S3 using SQL, but it is not a relational database.

Amazon Redshift is a relational database management system designed for data warehousing and analytics.

Amazon S3 Select allows querying specific data from S3 objects using SQL, but it is not a relational database.

Amazon Kinesis Data Streams is used for real-time data streaming, not for relational database management.