A heat engine operates in a continuous cycle between a high-temperature reservoir at \(T_H = 600 \text{ K}\) and a low-temperature reservoir at \(T_C = 300 \text{ K}\). In each cycle, the engine absorbs \(1200 \text{ J}\) of heat from the high-temperature reservoir and performs \(400 \text{ J}\) of net work. Which of the following correctly compares the efficiency of this heat engine to the theoretical maximum Carnot efficiency between these two reservoirs, and provides correct reasoning?