An aircraft's hydraulic system reservoir is found to be pressurized with bleed air from the engine's compressor section. What is the primary reason for pressurizing the reservoir?
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A
To increase the system's overall operating pressure.
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B
To prevent hydraulic fluid from foaming at high altitudes.
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C
To provide a backup source of pneumatic pressure for emergency systems.
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D
To cool the hydraulic fluid before it enters the pump.