Question: What is the primary purpose of the Nudm_UECM_PCscfRestoration service operation in the 5G System?
Option 1: To notify the AMF and/or SMF(s) about the need for P-CSCF Restoration.
Option 2: To update the SUPI information in the UDM.
Option 3: To retrieve the list of registered UE devices from the UDM.
Option 4: To initiate a new registration process for a UE device.
Explanation: The Nudm_UECM_PCscfRestoration service operation is used by the UDM to notify the AMF and/or SMF(s) that were indicated during registration in UDM to be notified of the need for P-CSCF Restoration. This notification is crucial for maintaining the correct configuration and ensuring seamless communication services in the 5G System.