Question: What is the primary functionality of the Security Edge Protection Proxy (SEPP) represented by a specific IOC in the 5G Network Resource Model (NRM), concerning inter-PLMN (Public Land Mobile Network) control plane interfaces?
Option 1: Load Balancing and Traffic Routing
Option 2: User Data Encryption and Authentication
Option 3: Network Slicing and Resource Allocation
Option 4: Message Filtering and Policing
Explanation: The correct answer, "Message Filtering and Policing", directly corresponds to the described functionality of the SEPP in the context of inter-PLMN control plane interfaces. This highlights the SEPP's role in securing and managing the flow of control messages between different Public Land Mobile Networks (PLMNs) in a 5G environment, ensuring only authorized and properly formatted messages are allowed to pass through.