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The correct answer is B.

OBJ-3.3: A power distribution unit (PDU) is a device fitted with multiple outputs designed to distribute electric power, especially to racks of computers and networking equipment located within a data center. PDUs use and distribute the available amperage more efficiently, allowing your equipment to receive the best available power to maintain operation. An uninterruptible power supply or uninterruptible power source (UPS) is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails. A generator is a device that converts motive power into electrical power for use in an external circuit. Generators can be powered by diesel, gasoline, or propane. Heating Ventilation and Air Conditioning (HVAC) units are responsible for maintaining the proper temperature and humidity within a datacenter.

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