Question: In a V2X Application Enabler (VAE) architecture, how can on-network dynamic group notifications be delivered between a VAE server and a service consumer, aside from the primary HTTP connection?
Option 1: Exclusive use of SMS (Short Message Service) for all notification types
Option 2: Utilization of WebRTC (Web Real-Time Communication) for peer-to-peer connections only
Option 3: Leveraging Websocket protocol for bi-directional, real-time communication
Option 4: Mandatory employment of FTP (File Transfer Protocol) for batch notification delivery
Explanation: The correct answer highlights the use of Websocket protocol for delivering notifications. This is suitable because Websockets enable bi-directional, real-time communication over the web, beneficial for dynamic group notifications requiring timely updates, aligning with efficient telecom network practices for low-latency applications like V2X communications. The other options are incorrect as SMS isn't used for real-time app data, WebRTC focuses on peer-to-peer media, and FTP is designed for file transfer, not real-time notifications.