Question: In a 5G System, what is the primary purpose of the GPSI-to-Subscription-Network resolution procedure supported by the Service Communication Proxy (SCP)?
Option 1: To authenticate User Equipment (UE) for voice call services
Option 2: To retrieve the PLMN ID for routing information retrieval in SMS services
Option 3: To manage Quality of Service (QoS) for video streaming applications
Option 4: To discover UDM NF profiles for further service operation invocation based on a recipient's GPSI
Explanation: The GPSI-to-Subscription-Network resolution procedure, supported by the SCP, is used to retrieve the PLMN ID associated with a recipient's Global Service Subscriber Identity (GPSI), crucial for discovering relevant Unified Data Management (UDM) Network Function (NF) profiles, which facilitate invoking UDM service operations for efficient SMS message handling.