Which of the following is an AWS key-value database offering consistent single-digit millisecond performance at any scale?

Explanations:

Amazon RDS is a relational database service that provides multiple database engines but does not specifically focus on key-value storage or consistent single-digit millisecond performance at any scale.

Amazon Aurora is a relational database designed for high performance and availability, but it is not a key-value database and does not guarantee single-digit millisecond performance across all scales.

Amazon DynamoDB is a fully managed NoSQL database service that offers key-value and document data structures. It is designed for consistent single-digit millisecond performance at any scale, making it suitable for high-traffic applications.

Amazon Redshift is a data warehousing service designed for analytics and big data processing, not for key-value storage, and does not provide single-digit millisecond performance at scale.