Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to make a simple homemade incubator for chicks [title] Cut out a hole at one end of a styrofoam cooler. [step] The hole will contain the light bulb and its socket. Insert the socket from any lamp and put in a 25 watt bulb.

Ending1: You can also use an empty tin can. Most disposable cans are free for use in incubator, but you may want to use a bigger one. Ending2: The hole should be at least 18 inches into the cooler. [title] Oil the side of the cooler lid with wd-40. Ending3: [title] Unscrew the lid and insert all of the light bulbs that came with the cooler in the hole. [step] If you had all of them back in the cooler to save time, pull out all of the end caps and put them back. Ending4: Place duct tape around the hole and the socket from inside and outside the cooler. This is very important in order to reduce the risk of fire.

Answer format: ending1/ending2/ending3/ending4