Which unit is capable of supplying power to an aircraft that is parked on the ground?

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A ground power unit (GPU) is specifically designed to provide electrical power to aircraft that are parked on the ground. When an aircraft is not in operation, it requires external power sources for systems such as lighting, air conditioning, and avionics, particularly when the engines are not running. The GPU supplies this necessary power, allowing for pre-flight preparations and maintenance to occur efficiently and effectively.

In contrast, other options serve different purposes. A refueler is focused on providing fuel to the aircraft, while a portable water tank delivers potable water. A catering truck is used to supply food and beverages for passengers on the aircraft. None of these options are designed to provide power, highlighting the unique function of a ground power unit in supporting ground operations for parked aircraft.