Question: What is the primary purpose of the Nudr_DM_Subscribe service operation in the 5G System?
Option 1: To subscribe to notifications for data modifications in the UDR.
Option 2: To retrieve specific data from the UDR.
Option 3: To update existing data in the UDR.
Option 4: To delete data from the UDR.
Explanation: The Nudr_DM_Subscribe service operation allows an NF service consumer to subscribe to notifications for changes, additions, or modifications to existing data in the UDR. This is evident from the description of the service operation, which states that it enables subscription to notification to data modified in the UDR.