A hydraulic power pump can either be electrically or __ driven.

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A hydraulic power pump can be powered by electricity or by hand. When operated manually, you use a hand pump or lever to move hydraulic fluid and create the pressure needed to run the system, which is essential when electrical power isn’t available or as a backup. The other possibilities aren’t as fitting here: using air to drive the pump would require a pneumatic setup, changing the type of drive, and driving the pump hydraulically would imply using hydraulic pressure to power the pump itself, which isn’t how these packs are normally configured.