227. Which of the following statements describes the function of the device labeled «C» shown in the illustration

The regulator, or pressure reducer, drops the supply pressure to the desired operating level.
Constant pressure is maintained at device "B" while device "C" is used only to modify the output signal.
The regulator reduces the pressure of the supply air to provide ancillary main engine services.
The device is a relief valve with feedback to prevent excessive pressure from damaging system components.

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