Question: In a Diameter charging application for Advice of Charge (AoC) service, what is the primary purpose of the AoC-Cost-Information AVP?
Option 1: To specify the format for sending AoC information to the User Equipment (UE)
Option 2: To provide a list of supported currencies for the AoC service
Option 3: To authenticate the UE before sending AoC updates
Option 4: To convey both accumulated and incremental cost information for the AoC service
Explanation: The AoC-Cost-Information AVP is designed to hold both accumulated and incremental cost information, making it a crucial component for providing detailed charging updates in AoC services, allowing for transparent and granular billing.