What type of database is Amazon DynamoDB? (CLF-C02)

Correct answer: C. Key-value.
Amazon DynamoDB is a NoSQL key-value and document-oriented database service. It is designed to handle large amounts of data and provide high performance, scalability, and reliability. DynamoDB stores data as key-value pairs, where each item is identified by a unique key, and the value can be a document, a set of attributes, or a binary object.

While DynamoDB does support document-oriented data models, its primary data model is key-value, making option C the most accurate answer.

In-memory databases (A) store data in RAM for faster access, but DynamoDB is a disk-based database. Relational databases (B) use a structured query language (SQL) and store data in tables with well-defined schemas, which is not the case with DynamoDB. Graph databases (D) are designed to store and query graph data structures, which is not the primary data model of DynamoDB.