Technician A says that if the electrical supply to an air dryer is interrupted,the dryer purge valve will immediately cease to function.Technician B says that the heater used in many air dryers is cycled by a thermostat.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Dryer Purge Valve

A component of a vehicle's air brake system, specifically in the air dryer, that releases moisture and contaminants to prevent them from entering the brake system.

Electrical Supply

The provision of electrical power to a device or system, which can be AC (Alternating Current) or DC (Direct Current) sourced from the grid, batteries, or generators.

Thermostat

Any of a number of different types of heat sensing switches; a thermostat usually changes the status of a circuit or system when a specific temperature value is achieved. Found on starters and other electrical components, also used in an engine cooling system where it is used to option coolant circulation to the radiator.