Which of the following best describes a reciprocal cross?
1) Pollen from a red-flowered plant is transferred to a white-flowered plant.
2) Pollen from plant "A" is transferred to plant "B", and pollen from plant "B" is transferred to plant "C".
3) Pollen from plant "A" is transferred to plant "B", and pollen from plant "B" is transferred to plant "A".
4) Pollen from two different plants is blended together and used to pollinate a third plant.