Question: What is the purpose of the Nnef_APISupportCapability service in the 5G System (5GS) architecture?
Option 1: To provide location services for UEs
Option 2: To inform Application Functions (AFs) about changes in service API availability or support level due to mobility between 5GC and EPC
Option 3: To manage Quality of Service (QoS) for UE sessions
Option 4: To authenticate and authorize UE access to network services
Explanation: The Nnef_APISupportCapability service is used to notify Application Functions (AFs) about changes in the availability or expected level of support of a given service API, which may occur due to mobility between 5GC and EPC. This allows AFs to adapt their behavior accordingly, ensuring seamless service continuity for UEs.