The correct answer is: D. RDS
Amazon Relational Database Service (RDS) is a web service that makes it easy to set up, operate, and scale a relational database in the cloud. It provides a familiar database environment that makes it easy to migrate existing applications to the cloud.
SimpleDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. It is easy to use and requires no database administration.
SQL Server is a relational database management system (RDBMS) developed by Microsoft. It is a full-featured database management system that supports a wide range of data types, including text, numbers, dates, and images. SQL Server is used by businesses of all sizes to store and manage data.
Oracle is a relational database management system (RDBMS) developed by Oracle Corporation. It is a full-featured database management system that supports a wide range of data types, including text, numbers, dates, and images. Oracle is used by businesses of all sizes to store and manage data.
In conclusion, the correct answer is D. RDS. RDS is a relational database service provided by Amazon. It provides a familiar database environment that makes it easy to migrate existing applications to the cloud.