Question: For Mission Critical (MC) service User Equipment (UE) utilizing only 5G System (5GS), how is the Data Network Name (DNN) made available to the UE for SIP-1, HTTP-1, and CSC-1 reference points?
Option 1: Via dynamic allocation during each session establishment
Option 2: Exclusively through UE preconfiguration without any option for update
Option 3: Either via UE (pre)configuration or via initial UE configuration on a per Home Public Land Mobile Network (HPLMN) and optionally also per Visited Public Land Mobile Network (VPLMN) basis
Option 4: Automatically assigned by the network without prior configuration
Explanation: This is correct because, according to the specifications for MC services over 5GS, the DNN for critical communication reference points can be provided to the UE through either preconfiguration or initial configuration, allowing flexibility based on network (HPLMN/VPLMN) configurations. This approach ensures that MC service UEs have the necessary network access information for seamless operation across different networks if required.