Question: In a Proximity-based Services (ProSe) scenario, what charging data can the EPS collect for ProSe Discovery features, specifically when a ProSe-enabled UE discovers another ProSe-enabled UE?
Option 1: Only the technology used for ProSe Discovery (e.g., E-UTRA or WLAN)
Option 2: Just the event of discovering a ProSe-enabled UE, without any additional details
Option 3: The ability to discover other ProSe-enabled UEs, including based on the range class, and the technology (e.g., E-UTRA or WLAN) used for ProSe Discovery
Option 4: None of the above; EPS does not collect charging data for ProSe Discovery features
Explanation: According to ProSe Charging Requirements, when a ProSe-enabled UE discovers another ProSe-enabled UE, the EPS collects detailed charging data, including the discovery event, range class-based discovery ability, and the technology used (e.g., E-UTRA or WLAN), making Option 3 the most comprehensive answer.