The diagram shows part of the spinal cord, a fingertip, and a muscle of the arm. What is the route of a reflex arc impulse from the finger to the muscles of the arm?

1 → 6 → 5 → 4 → 3

2 → 1 → 6 → 5 → 4

3 → 4 → 6 → 2 → 5

4 → 5 → 6 → 1 → 2

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