What is the most important safety rule in operating the power take-off, PTO?

1. AThe power take-off should be operated only when the engine is already hot.
2. BOne must not be near the moving parts on the tractor and on the implement.
3. CThe power take-off must not be operated without the supervision of an additional operator on the ground.
4. DThe power take-off must not be operated while driving, but only when standing still.

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