Question: What triggers the reporting of changes of UE presence in a Presence Reporting Area for a specific UE?
Option 1: Change of UE's location within the same Tracking Area (TA)
Option 2: Receipt of a request from the PDN GW using the Presence Reporting Area Action parameter
Option 3: Handover of the UE to a different eNodeB or cell
Option 4: Modification of the UE's Quality of Service (QoS) profile
Explanation: The reporting of changes of UE presence in a Presence Reporting Area is triggered as defined in TS 23.203, and it is initiated by the PDN GW sending a request to Start/Stop reporting of changes of UE presence for one or more Presence Reporting Area(s) using the Presence Reporting Area Action parameter.