Which of the following best describes Amazon Aurora?

Amazon Aurora is a high-performance relational database engine that is designed to deliver the performance and availability of high-end commercial databases at a fraction of the cost. It is fully compatible with MySQL and PostgreSQL, which allows for seamless integration and migration for applications already using these popular databases. Aurora automatically scales storage up to 128 TB, and its architecture is optimized for cloud environments, making it not only efficient but also cost-effective.

The design of Aurora includes several features that enhance its performance, such as a distributed storage system that separates compute and storage to allow for better resource utilization and faster recovery from failures. Additionally, it has a high throughput and low latencies that result in better performance compared to standard relational databases.

In contrast, the other options either describe different types of services offered by AWS or do not align with the characteristics of Amazon Aurora. For instance, a low-performance relational database would not accurately capture the advantages of Aurora, and characterizing it as a NoSQL service misunderstands its fundamental architecture. Similarly, calling it a static file storage service does not reflect its core functionality as a dynamic database system designed for transactional workloads and complex queries.