Amazon RDS supports a variety of database engines, including MariaDB, Microsoft SQL Server, MySQL, Oracle, and PostgreSQL. The correct answers to the question are Microsoft SQL Server (Option B) and PostgreSQL (Option E). These are both widely used relational database management systems that are supported by Amazon RDS. Microsoft SQL Server offers various editions, including Express, Web, Standard, and Enterprise, allowing for flexibility in database deployment. PostgreSQL is a powerful open-source system that is also supported by RDS, making it easier to set up, operate, and scale PostgreSQL databases in the cloud.