Please choose the correct answer to the question: Cows know there is salt in a mineral lick because

Answer1: they have receptors on their tongue that allow them to experience spice and seasonings Answer2: a cow in the ocean told them it was there Answer3: it's on their side of the pasture's fence Answer4: they evolved where there were great redwood trees

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