Question: What is the purpose of the Nnef_Trigger_DeliveryNotify service operation in the 5G System (5GS)?
Option 1: To report the status of trigger delivery to the consumer.
Option 2: To request a new trigger from the NEF.
Option 3: To cancel an existing trigger subscription.
Option 4: To update the consumer's profile information.
Explanation: The Nnef_Trigger_DeliveryNotify service operation is used by the NEF to report the status of trigger delivery (failure or success) to the consumer, which corresponds to an implicit subscription by the Nnef_Trigger_Delivery service operation.