Question: What is the primary purpose of the ProSe Relay UE ID in a telecommunications network?
Option 1: To identify the serving cell for a User Equipment (UE) in a 5G RAN
Option 2: To authenticate UE-to-UE direct communication over the internet
Option 3: To identify the link layer address for ProSe direct communication by a ProSe UE-to-network relay UE
Option 4: To manage Quality of Service (QoS) for voice calls in LTE networks
Explanation: The correct answer highlights the specific role of the ProSe Relay UE ID in identifying the link layer address used for direct communication by a relay UE in Proximity-based Services (ProSe), enabling direct device-to-device communications without routing through the core network, a key aspect of ProSe functionality.