Please choose the correct solution to the question: To make ice last longer in a cooler.

Solution1: When you go to the beach and take your cooler with you, sprinkle salt on the ice so that it stays frozen for much longer.

Solution2: When you go to the beach and take your cooler with you, sprinkle chocolate chips on the ice so that it stays frozen for much longer.

Answer format: solution1/solution2
Answer: solution1