Question: In roaming scenarios where the Home Public Land Mobile Network (HPLMN) does not support Dual Connectivity Networks (DCNs), how may the serving Mobility Management Entity/Serving GPRS Support Node (MME/SGSN) select a DCN for the visiting User Equipment (UE)?
Option 1: Based on the UE's International Mobile Subscriber Identity (IMSI)
Option 2: Using operator-specific policies based on other subscription or UE-provided information
Option 3: Randomly selecting from available DCNs in the Visited Public Land Mobile Network (VPLMN)
Option 4: Not possible, as the HPLMN must always provide a UE Usage Type parameter for DCN selection
Explanation: In roaming scenarios where the HPLMN does not support DCNs, the serving MME/SGSN may use operator-specific policies based on other subscription or UE-provided information to select a suitable DCN for the visiting UE. This approach allows the network to adapt to different roaming agreements and UE capabilities while ensuring efficient resource allocation.