Question: What is a characteristic of Group IDs for Voice Group Call Service (VGCS) and Voice Broadcast Service (VBS) within a Public Land Mobile Network (PLMN)?
Option 1: Group IDs for VGCS and VBS must be unique across both services within a PLMN.
Option 2: No uniqueness is required between the sets of Group IDs for VGCS and VBS, allowing for intersecting or identical sets at the network operator's discretion.
Option 3: Group IDs for VGCS are unique globally, while those for VBS are unique only within a PLMN.
Option 4: The uniqueness of Group IDs for VGCS and VBS is determined by the SIM card specifications.
Explanation: This option correctly reflects that there's no requirement for Group IDs to be unique between Voice Group Call Service (VGCS) and Voice Broadcast Service (VBS) within a Public Land Mobile Network (PLMN), giving network operators flexibility to have intersecting or identical sets of Group IDs for these services.