Question: In a 5G System supporting Mission Critical (MC) services, what is a key functionality of a UE-to-Network Relay utilizing 5G ProSe Layer-3 relaying technique for MC traffic?
Option 1: To prioritize non-MC services over the NR PC5 reference point
Option 2: To establish direct communication between two remote MC service UEs without infrastructure
Option 3: To provide location services for all UEs in proximity, regardless of MC service support
Option 4: To enable connectivity and relay MC traffic from a remote MC UE to the 5GS via a relay UE, with or without N3IWF support
Explanation: This is correct because the 5G ProSe Layer-3 UE-to-Network relaying technique, as utilized in Mission Critical services, is specifically designed to provide means of connectivity and relaying for MC traffic. This can be achieved with or without the support of the N3IWF, facilitating access to the 5G System for remote MC service UEs through a relay UE over the NR PC5 reference point.