Question: How do untrusted Application Functions interact with relevant Network Functions in a 5G System?
Option 1: Directly, without any intermediate function.
Option 2: Via the external exposure framework using the Network Exposure Function (NEF).
Option 3: Through the Policy and Charging Control Framework.
Option 4: By influencing traffic routing decisions.
Explanation: According to the 5G System architecture, untrusted Application Functions are not allowed to access Network Functions directly. Instead, they use the external exposure framework via the NEF to interact with relevant Network Functions, ensuring a secure and controlled interaction between the AF and the 3GPP Core Network.