Question: What happens to the UE's request for IMS Emergency services if authentication fails during the security mode control procedure?
Option 1: The UE is allowed to proceed with the emergency session without integrity protection or ciphering.
Option 2: The UE is redirected to a different network for emergency services.
Option 3: The UE's request is put on hold until authentication is successful.
Option 4: The UE's request is treated the same way as any failed registration.
Explanation: According to the security procedures, if authentication fails during the security mode control procedure, it shall be treated the same way as any failed registration. This means that the UE's request for IMS Emergency services will not be granted until successful authentication is completed.