Question: What is the purpose of the Nnrf_NFManagement_NFDeregister service operation in the 5G System?
Option 1: To register a new NF instance with the NRF.
Option 2: To inform the NRF about the unavailability of an NF consumer.
Option 3: To update the NF profile information in the NRF.
Option 4: To retrieve the list of available NF instances from the NRF.
Explanation: The Nnrf_NFManagement_NFDeregister service operation is used to inform the NRF about the unavailability of an NF consumer, as indicated by the input "Reason indication". This allows the NRF to update its records and prevent any further requests being sent to the unavailable NF instance.