Finish the following sentence with the best choice: Inflate a balloon.

Choices:
- 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.
- 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:
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.