Question: What is the maximum allowed time for a UE to select a Sidelink Relay UE and transmit the PC5-SP direct communication setup message using ProSe Direct Communications, as per E-UTRA radio resource management requirements?
Option 1: 500ms
Option 2: 600ms
Option 3: 750ms
Option 4: 680ms
Explanation: This question assesses understanding of E-UTRA's radio resource management, specifically the timing requirements for sidelink relay UE selection. The correct answer, 680ms, reflects the maximum allowed delay to transmit the setup message, ensuring efficient communication setup in ProSe Direct Communications scenarios, crucial for maintaining effective network performance and user experience.