Question: What is the primary purpose of the Nudm_SDM_Subscribe service operation in the 5G System (5GS)?
Option 1: To request a specific set of subscription data from the UDM.
Option 2: To update the subscription data stored in the UDM.
Option 3: To authenticate the NF consumer before granting access to subscription data.
Option 4: To subscribe for updates to Subscription Data indicated by the 'subscription data type' input.
Explanation: The Nudm_SDM_Subscribe service operation allows an NF consumer to subscribe for updates to specific subscription data, as indicated by the 'subscription data type' input. This enables the NF consumer to receive notifications when the subscribed data changes.