Question: In a V2X Application Enabler (VAE) architecture, how can Notifications be delivered between a VAE server and a service consumer, aside from using a separate HTTP connection?
Option 1: Exclusive use of SMS (Short Message Service) protocol
Option 2: Utilization of FTP (File Transfer Protocol) for bulk notifications
Option 3: Employment of Email protocols (e.g., SMTP, IMAP)
Option 4: Leveraging Websocket technology (as per IETF RFC 6455)
Explanation: In the context of VAE services for efficient and real-time communication, especially in vehicular environments where low latency is crucial, Websocket technology offers a bi-directional, real-time communication channel. This aligns with the requirements for delivering notifications in such scenarios, making it a suitable choice alongside traditional HTTP connections for notification delivery. The other options (SMS, FTP, Email protocols) are less suited due to inherent latency, security concerns, or lack of bi-directional real-time capabilities in this specific application context.