Answer: Amazon Neptune

The correct answer is D, Amazon Neptune. Amazon Neptune is a fully managed graph database service provided by AWS that is designed to store and manage highly connected data with complex relationships. It supports two popular graph models: property graph and W3C's Resource Description Framework (RDF), and their respective query languages, Apache TinkerPop Gremlin and SPARQL. This allows developers to efficiently query and navigate large, highly connected datasets with low latency. The other options are not designed for graph data: Amazon DynamoDB is a NoSQL key-value and document database, Amazon RDS is a relational database service, and Amazon QLDB is a ledger database that provides a transparent, immutable, and cryptographically verifiable ledger for applications requiring traceability and auditability.

Author: LeetQuiz Editorial Team