The correct answer is: A. SQL.
RDS stands for Relational Database Service. It is a fully managed database service that makes it easy to set up, operate, and scale a relational database in the cloud. RDS provides you with six familiar database engines to choose from, including Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle, and Microsoft SQL Server.
RDS is a SQL database service. SQL stands for Structured Query Language. It is a programming language designed for managing data in relational database management systems (RDBMS). SQL statements are used to perform tasks such as update data on a database or retrieve data from a database.
Non-SQL databases are a type of database that does not use SQL as its primary language. Non-SQL databases are often used for storing and managing large amounts of unstructured data. Some examples of non-SQL databases include MongoDB, Cassandra, and Hadoop.
Simple storage is a type of storage that is not designed for storing data in a relational database. Simple storage is often used for storing files or other types of data that do not need to be stored in a relational database.
In conclusion, RDS is a SQL database service. It is a fully managed database service that makes it easy to set up, operate, and scale a relational database in the cloud. RDS provides you with six familiar database engines to choose from, including Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle, and Microsoft SQL Server.