The correct answer is: D. All of the mentioned
Amazon Relational Database Service (Amazon RDS) is a fully managed database service that makes it easy to set up, operate, and scale a relational database in the cloud. Amazon RDS provides you with six familiar database engines to choose from, including Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle, and SQL Server.
Amazon Aurora is a MySQL and PostgreSQL-compatible relational database service that offers up to 5 times the performance and 6 times the availability of standard MySQL and PostgreSQL databases. Amazon Aurora is a fully managed service that requires no database administration.
PostgreSQL is a powerful, open-source database management system that is used by many organizations around the world. PostgreSQL is known for its reliability, scalability, and flexibility.
MySQL is a popular, open-source database management system that is used by many organizations around the world. MySQL is known for its ease of use, performance, and reliability.
MariaDB is a fork of MySQL that is developed by the original developers of MySQL. MariaDB is similar to MySQL, but it includes some additional features and improvements.
Oracle is a popular, proprietary database management system that is used by many organizations around the world. Oracle is known for its performance, scalability, and reliability.
SQL Server is a popular, proprietary database management system that is used by many organizations around the world. SQL Server is known for its performance, scalability, and reliability.
All of these database engines are supported by Amazon RDS, so you can choose the one that best meets your needs.