Please choose the correct answer to the question: In snapdragon plants, red flowers are dominant to white flowers. When red-flowered plants are crossed with white-flowered plants, pink flowers are produced. If a researcher wants to produce plants with only white flowers, what color should the parent plants be?

Answer1: both red Answer2: both white Answer3: one red and one white Answer4: one white and one pink

Answer format: answer1/answer2/answer3/answer4