When the "standard operating speed" of the power take-off (PTO) is specified, what is meant?

1. AThe rpm of the oil pump that drives the power take-off.
2. BThe rpm at which the output shaft from the gearbox rotates.
3. CThe rpm of the engine itself (output at the flywheel).
4. DThe rpm of the power take-off output and of its drive shaft.

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