Question: What type of delivery is supported for Mission Critical (MC) service communications over 5G Proximity-based Services (ProSe) User Equipment (UE)-to-network relay, according to current specifications?
Option 1: Multicast and Broadcast (MBS) for both unicast and group communications
Option 2: Unicast delivery only for MCPTT (Mission Critical Push-to-Talk) services
Option 3: Unicast delivery for all MC service communications over 5G ProSe UE-to-network relay
Option 4: Broadcast only for emergency alert systems within MC services
Explanation: This is correct because MC service communications over 5G ProSe UE-to-network relay are specifically supported for unicast delivery, with no current support mentioned for multicast/broadcast MBS sessions for all MC services over this relay.