What is the function of the Automatic Air Dryer (secador de aire con cartucho desecante) located between the compressor and the primary air tanks?

1. To blow warm air into the driver's footwell
2. To filter out oil droplets and remove water vapor from the compressed air using desiccant material, purging collected moisture automatically via an exhaust valve
3. To cool the turbocharger intake air
4. To inject ether into the fuel injection rail