An engine is received that hunts and surges at top no-load speed only. To determine whether the carburetor or the governor system is causing the symptom, a specific troubleshooting process can be followed. Technician A says that to separate the governor system from the carburetor, simply hold the throttle plate still and see if the engine continues to hunt & surge. Technician B says that hunting and surging is caused exclusively by a lean mixture in the carburetor. Which technician is correct? Technician A Technician B Both technicians A and B Neither technicians A nor B