Question: In a 5G network, what triggers the collection of charging information for a 5G LAN-type service in addition to resource usage (e.g., licensed or unlicensed spectrum, QoS, applications)?
Option 1: Change in User Equipment's (UE) Quality of Service (QoS) settings
Option 2: UE Handover between different Radio Access Technologies (RATs)
Option 3: Update to the UE's subscription profile in the Home Public Land Mobile Network (HPLMN)
Option 4: When a User Equipment (UE) joins or leaves a specific private communication
Explanation: According to service requirements for the 5G system, specifically for 5G LAN-type services, charging information collection is triggered by events like a UE joining or leaving a specific private communication, in addition to resource usage, to ensure billing accurately reflects the dynamic nature of private communications within a 5G LAN setup.