What is the role of the central lifting arm (the third point)?

1. ATo raise the implement several times to its maximum height, in order to make sure the implement is hitched correctly.
2. BTo eliminate the freedom of movement of the arms and the implement up and down.
3. CTo eliminate the sideways freedom of movement of the arms and the implement and to prevent the implement from swivelling.
4. DTo secure the hitched implement with special securing chains.

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