Question: What information must the 3GPP core network provide for charging purposes when an Evolved ProSe Remote UE uses either a direct or Indirect 3GPP Communication, that is NOT explicitly required for an Evolved ProSe Relay UE in the same scenario?
Option 1: Identification of UEs involved
Option 2: Timestamp when the connection mode changes
Option 3: Type of Application used for Communication
Option 4: Cell ID of the Serving Base Station
Explanation: The correct answer is Option 3 because, according to the provided context, both Evolved ProSe Remote UE and Relay UE require similar types of charging information when using direct or Indirect 3GPP Communication. However, 'Type of Application used for Communication' is not listed among the required charging information for either UE type in this scenario, making it the correct answer as it's what is NOT explicitly required for an Evolved ProSe Relay UE (or Remote UE) in this scenario.