Question: What is the primary purpose of the `Notify_Update_Session` service operation in the context of VAE (V2X Application Enabler) services?
Option 1: To initiate a new session for vehicle-to-everything (V2X) communications.
Option 2: To terminate an existing session-oriented service.
Option 3: To request additional resources for an ongoing session.
Option 4: To notify the VAE server of updates to an established session-oriented service.
Explanation: The correct answer, Option 4, aligns with the described functionality of `Notify_Update_Session`, which is specifically used for notifying updates to already established session-oriented services by the VAE server. This highlights its role in managing and updating existing communication sessions, ensuring seamless and adaptive V2X communications.