Question: What is the primary purpose of the Nu reference point in the Policy and Charging Control architecture?
Option 1: To facilitate direct communication between User Equipment (UE) and the Policy and Charging Rules Function (PCRF)
Option 2: To enable the Service Capability Exposure Function (SCEF) to manage Quality of Service (QoS) for specific applications
Option 3: To allow the Policy and Charging Enforcement Function (PCEF) to retrieve charging rules from the Online Charging System (OCS)
Option 4: To enable a 3rd party service provider to manage Policy and Charging Control Decision Functions (PFDs) in the Policy and Charging Control Decision Function Database (PFDF)
Explanation: The Nu reference point is specifically designed for communication between the Service Capability Exposure Function (SCEF) and the Policy and Charging Control Decision Function Database (PFDF), allowing external parties to influence policy decisions by managing PFDs, thus enabling 3rd party service providers to have a managed role in policy and charging control.