Which interfaces are primarily used for communication between controller groups?

The choice regarding East/Westbound Interfaces is correct because these interfaces are designed specifically for communication between different controller groups within a software-defined networking (SDN) architecture. East/Westbound communication typically facilitates interactions among various network controllers, allowing them to share information, collaborate on tasks, and maintain a cohesive network operation.

In SDN, each controller can operate distinctly while also needing to communicate effectively with others to ensure coordinated management of the network resources. This type of interface is crucial for maintaining the integrity and performance of the overall network as it allows for horizontal communication across controllers.

In contrast, Northbound Interfaces are primarily oriented towards providing communication between the SDN controller and applications or management platforms, while Southbound Interfaces connect the SDN controller to the underlying networking devices such as switches and routers. Point-to-Point Interfaces do not specifically relate to the controller-to-controller communication in the context of SDN. Therefore, East/Westbound Interfaces distinctly serve the role of enabling effective collaboration and communication among controller groups.