120. A sequential lift, nozzle valve control bar on a turbo-generator, utilizes which of the following operating principles?

A hydraulic piston raises or lowers individual valves according to pressure received from a governor.
A hydraulic piston raises or lowers groups of valves according to pressure received from a governor.
A servomotor, mechanically connected to nozzle valve handwheels, opens or closes the valves in accordance with the type of electrical signal received.
A lifting beam mechanism engages nozzle valve stems of varying lengths.

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