Question: What is the primary purpose of the Subscription Expiry Notification sent by the Unstructured Data Storage Function (UDSF) to an NF Consumer?
Option 1: To notify changes in user data stored on the UDSF.
Option 2: To request additional storage capacity for an NF Consumer.
Option 3: To confirm successful subscription to notification services.
Option 4: To inform that a Subscription to Notification due to Data Change has expired or is about to expire.
Explanation: The correct answer, Option 4, aligns with the described functionality of the Subscription Expiry Notification in telecom networks. This notification is crucial for NF Consumers to manage their subscriptions effectively, especially those related to data change notifications. Understanding the purpose of such notifications is vital for managing resources and maintaining seamless communication services. Options 1 through 3 are incorrect as they do not accurately reflect the primary purpose of the Subscription Expiry Notification as it relates to subscription status rather than data changes, capacity requests, or confirmation of successful subscriptions.