Which statement is true about AWS Aurora?

AWS Aurora is a relational database service that is designed to be compatible with both MySQL and PostgreSQL. This compatibility allows users to use existing tools and applications built for these popular open-source databases without significant modification. Aurora offers the performance and availability features of high-end commercial databases while maintaining the cost-effectiveness of open-source solutions.

This compatibility aspect is significant as it enables organizations to migrate their applications with minimal friction, utilizing the capabilities of Aurora such as automatic scaling, advanced security features, and high availability. Aurora's ability to support both MySQL and PostgreSQL engines makes it a flexible choice for different types of applications and workloads.

The other options are not accurate representations of AWS Aurora's features or capabilities. This ensures a clearer understanding of Aurora's role as a hybrid solution that provides the best of both worlds from the MySQL and PostgreSQL databases.