AWS Certified Cloud Practitioner Practice Exam

Amazon RDS (A) stands for Amazon Relational Database Service, a cloud-based service for creating and managing relational databases such as MySQL, Oracle, and PostgreSQL. It allows users to easily scale their databases, perform automatic backups, and manage security.

Amazon DynamoDB (B) is a NoSQL database service, which means it is not a relational database and does not use SQL for querying data.

Amazon Redshift (C) is a data warehousing service, which differs from a traditional relational database in terms of functionality and purpose. It is designed for handling large amounts of data and performing complex analytics, rather than daily transactions and data management.

Amazon EMR (D) stands for Amazon Elastic MapReduce, a service used for processing large amounts of data using open source tools such as Hadoop, Spark, and Presto. While some databases can be integrated with EMR, it is not specifically designed for relational databases.

Overall, Amazon RDS is the best choice for creating and managing a relational database in AWS, while the other options are better suited for other purposes.