Please choose the correct answer to the question: How do the spines of a cactus help it survive?

Answer1: Spines help the cactus get moisture. Answer2: Spines anchor the cactus in the ground. Answer3: Spines protect the cactus from animals. Answer4: Spines support the stems and branches of the cactus.

Answer format: answer1/answer2/answer3/answer4