In the heart, as the action potential reaches the AV node from the SA node, there is a delay of the action potential. This delay is important because :

1. A. (1) It allows right atria to receive the blood from vena cava
2. B. (2) It allows atria to rest
3. C. (3) It allows a stronger right atrial contraction
4. D. (4) It allows ventricles to receive all the blood from the atria

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