Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to fix a dented ping pong ball [title] Heat a cup of water. [step] Boil a small pot of water. Pour the water into a ceramic cup.

Ending1: [substeps] You can put the ball directly in the pot of water, but don't leave it in for more than a couple minutes. Ping pong balls can melt or burn when overheated. Ending2: Place a cap over the top of the cup and heat for a few minutes to evaporate the water. Be careful when heating the water as you do not want to burn your nose and mouth. Ending3: Pour the water and water mixture into the ball. Cover the cup and allow it to let the water infuse the ping pong ball for 10 to 30 minutes. Ending4: Heat the cup at a medium temperature for 6-8 minutes. Carefully dump the water out and set the cup aside in the sink.

Answer format: ending1/ending2/ending3/ending4