Oracle NoSQL Database Cloud Service utilizes a key-value data model.

C. Each data item is uniquely identified by a key, and the associated value can be any data type or structure.

Key-Value Data Model:

The key-value model is fundamentally based on a simple association between a unique key and its corresponding value.

The value can be a simple data type (string, number) or a complex structure (like JSON).

Oracle NoSQL Database Cloud Service uses this model to ensure efficient, scalable data access.

Why the other options are incorrect:

A. Organized into tables with schemas:This represents a relational database model.

B. Stored as JSON documents:Although NoSQL can store JSON, the fundamental model is still key-value.

D. Relationships defined through foreign keys and joins:This is typical of relational databases.

E. Graph format with nodes and edges:Represents a graph database model, not key-value.