Please choose the correct answer to the question: A hillside along a highway has exposed layers of undisturbed sedimentary rock. Which method would be best for scientists to use to determine the relative age of these sedimentary rock layers?

Answer1: apply the law of superposition Answer2: calculate the rate of radiometric decay Answer3: apply the law of crosscutting relationships Answer4: calculate the rate of tectonic plate movement

Answer format: answer1/answer2/answer3/answer4
Answer: answer1