Question: In the context of the Gx protocol for Policy and Charging Control (PCC), what role does the PCRF assume in relation to the Diameter protocol over the Gx interface?
Option 1: Diameter Client, requesting PCC rules for network resource allocation
Option 2: Diameter Server, handling PCC Rule requests for a particular realm
Option 3: Relay Agent, redirecting messages between PCEF and external networks
Option 4: Translation Agent, converting protocol messages for interoperability
Explanation: The PCRF acts as a Diameter Server over the Gx interface, handling and responding to PCC Rule requests specific to its managed realm, providing policy decisions to the PCEF, which acts as the Diameter Client. This server role is crucial for the PCRF's function in managing policy and charging rules within the telecom network.