Question: What is the uniqueness requirement for Group IDs within a Public Land Mobile Network (PLMN) for Voice Group Call Service (VGCS) and Voice Broadcast Service (VBS)?
Option 1: Unique across both VGCS and VBS
Option 2: Unique within VGCS but not within VBS
Option 3: Unique within each service (VGCS and VBS) separately, but no uniqueness is required between the two services
Option 4: No uniqueness is required within either VGCS or VBS
Explanation: According to the specifications, Group IDs for VGCS are unique within a PLMN, and similarly, Group IDs for VBS are also unique within a PLMN. However, there is no requirement for uniqueness between the sets of Group IDs for VGCS and VBS, meaning they can be intersecting or even identical at the option of the network operator.