What framework is used for structuring REST APIs in APIC-EM?

The correct choice is Swagger, which is widely recognized as a framework for designing and documenting RESTful APIs. It provides a comprehensive set of tools for developers to create APIs by offering a user-friendly interface that includes beautiful documentation, which can be easily shared among team members or integrated into software documentation.

Swagger facilitates the structured representation of REST APIs through its specification format known as the OpenAPI Specification (OAS). This allows developers to define API endpoints, request/response formats, and authentication methods in a standardized manner. When utilizing Swagger in the context of APIC-EM (Application Policy Infrastructure Controller Enterprise Module), it enables resource visibility and interaction in a straightforward way, encouraging effective API utilization-oriented development.

In contrast, NETCONF is more focused on network management and configuration, using XML over SSH, rather than the RESTful architecture that Swagger supports. Postman is a popular API client primarily used for testing APIs, but it does not serve as a framework for structuring them. The term REST itself pertains to the architectural style which APIs are built upon, but it does not represent a specific framework or tool for documentation or design.