Please choose the correct answer to the question: Until recently the Grand Canyon was thought to be about 5-6 million years old. Recently a scientist gathered data and wrote a paper for a scientific journal that indicated the canyon is about 17 million years old. Before this new information about the canyon is accepted, which of these needs to occur?

Answer1: The scientist needs to publish additional papers. Answer2: The scientist needs to obtain government support. Answer3: Other scientists need to state their beliefs. Answer4: Many scientists need to evaluate the data.

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