Please choose the correct solution to the question: Inflate a balloon.

Solution1: Stretch the opening of the balloon over the outlet of a helium tank, then open the valve on the tank until the balloon is full. Remove the balloon and cut off the opening.

Solution2: Stretch the opening of the balloon over the outlet of a helium tank, then open the valve on the tank until the balloon is full. Remove the balloon and tie off the opening.

Answer format: solution1/solution2