Question: What is the primary purpose of the 'Establish_Session' service operation in the context of VAE (V2X Application Enabler) Services?
Option 1: To initiate the teardown of an existing session-oriented service by the VAE server.
Option 2: To trigger the establishment of the session-oriented service by the VAE server.
Option 3: To modify the parameters of an already established session-oriented service.
Option 4: To query the status of all active session-oriented services.
Explanation: The correct answer, 'To trigger the establishment of the session-oriented service by the VAE server,' aligns with the described functionality of the Establish_Session service operation. This highlights its role in initiating new sessions, which is crucial for setting up communication channels in V2X (Vehicle-to-Everything) scenarios, ensuring that applications can effectively utilize network resources for data exchange.