The one that describes braking from a brake chamber containing a power spring is a spring applied and air-released service brake. The correct option is D.
Spring brakes, unlike service brakes, are not air applied. They apply when air pressure is released from the brake chamber and release when air pressure is restored. Spring brakes and service brakes use different types of brake chambers.
The braking power of spring brakes is determined by how well the brakes are adjusted. If the brakes are not properly adjusted, neither the regular nor the emergency/parking brakes will function properly.
A spring applied and air-released service brake is the one that describes braking from a brake chamber containing a power spring.
Thus, the correct option is D.
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