Commonly Used Data Formats with REST API

C.

JavaScript Object Notation (JSON) and Extensible Markup Language (XML) are the most commonly used data formats for the Representational State Transfer (REST) API, and are typically implemented with caching for increased scalability and performance.

The most commonly used data formats with the REST API are JSON (JavaScript Object Notation) and XML (Extensible Markup Language).

JSON is a lightweight data format that is easy to read and write. It is widely used in web applications as it can be easily parsed by JavaScript. JSON is structured using key-value pairs and arrays, making it a good choice for exchanging data between systems.

XML, on the other hand, is a more verbose data format that is widely used in enterprise environments. It is structured using tags, attributes, and values, which makes it more flexible than JSON. XML is often used in applications that require complex data structures and for exchanging data between different systems that use different programming languages.

SAML (Security Assertion Markup Language) is a standard for exchanging authentication and authorization data between different systems. It is not a data format but a protocol that uses XML to exchange security information.

HTML (Hypertext Markup Language) is a markup language used to create web pages. It is not a data format, but it can be used to display data obtained from a REST API.

Therefore, the correct answer to the question is C. XML and JSON are the most commonly used data formats with the REST API.