Question: In a roaming scenario, where is the 3GPP Offline Charging System (OFCS) located for transporting charging information about a 3GPP User Equipment (UE)?
Option 1: Visited Public Land Mobile Network (VPLMN) and Home Public Land Mobile Network (HPLMN)
Option 2: Only in the Home Public Land Mobile Network (HPLMN)
Option 3: In the Visited Public Land Mobile Network (VPLMN)
Option 4: In a Third-Party Charging Network
Explanation: According to telecom standards for roaming scenarios, charging information for a 3GPP UE is typically handled in the network where the UE is currently roaming. Thus, for a roaming scenario, the OFCS responsible for handling charging info would be located in the Visited Public Land Mobile Network (VPLMN), ensuring localized management of temporary subscriber services and billing.