Which AWS service is designed to provide low-latency, scalable storage for key-value workloads?

• A. Amazon ElastiCache
• B. Amazon DocumentDB
• C. Amazon DynamoDB
• D. Amazon Neptune

Answer: (C)

This question focuses on finding a service built for low-latency, scalable storage for key-value workloads. Amazon DynamoDB is a fully managed NoSQL database designed specifically for fast, predictable performance with key-value and document data. It delivers single-digit millisecond latency at any scale and can automatically partition data to grow as your workload increases, with flexible capacity options (on-demand or provisioned) and features like DynamoDB Accelerator for even faster reads. The other options serve different roles: ElastiCache is an in-memory caching layer to speed up data access from other stores, not the primary durable store; DocumentDB handles JSON-like documents but isn’t optimized primarily for key-value access patterns at scale; Neptune is a graph database suited for relationship-heavy queries, not general key-value workloads. So DynamoDB best fits the requirement.