Please choose the correct ending to complete the given sentence: Health: [header] How to make a vaporizer [title] Gather your supplies. [step] For this vaporizer, you will need a clear light bulb (100 watts is best, and don't use one that is painted white inside), a sharp knife, pliers, glass straws or tubes, tape, scissors, and the cap from a 500ml bottle. [title] Cut the end off the light bulb.

Ending1: [step] The capped end of the light bulb will be sterilized in most situations, but you can use a garden hose to check. [title] Melt the bottom of the lit part of the light bulb. Ending2: [step] Cut out the entire rectangle section that ends the light bulb base, about 1 centimeter (0.31 inch) from the upper right corner. [title] Measure the height of the light bulb at either end. Ending3: [step] Take your knife to cut off the metal tip of the light bulb where you would typically screw it into the socket. Try to cut it smoothly to avoid rough edges. Ending4: [step] Prepare for using the glass straws only: cut a long piece of metal tubing. Pick up a 9 " x11 " rectangular tube.

Answer format: ending1/ending2/ending3/ending4