A user is planning to host data with RDS. Which of the below mentioned databases is not supported by RDS?

A.
PostgreSQL

B.
SQLDB

C.
Oracle

D.
MS SQL

Explanation:
Amazon Relational Database Service (Amazon RDS) is a web service that makes it easier to set up, operate, and scale
a relational database in the cloud. AWS RDS supports popular DBs, such as MySQL, PostgreSQL, MS SQL and Oracle.
This means that the code, applications, and tools user is already using with existing databases can be used with Amazon
RDS too. In short, it is a managed Relation Database offering from AWS which manages backups, software patching,
automatic failure detection, and recovery of Database.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html