Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to get rid of rats in apartment buildings [title] Use wooden snap traps. [step] You will need to make sure that your traps are big enough for a rat. You can buy larger traps or make the trigger of a small trap bigger by attaching a 2-inch (5 centimeters) piece of cardboard to it.

Ending1: Cut the cardboard and then place the trigger on top of the cardboard. The spring should naturally naturally begin to close when it touches the cardboard, keeping the rats in place. Ending2: [substeps] Also make sure that the bait is oil-based. A gallon of olive oil will not kill rats, but it will kill them slightly. Ending3: The cardboard will trigger the trap if a rat steps on it. [substeps] You can also try a wooden snap box trap, which is better for outside. Ending4: You can also use metal or rubber wire to make the trigger of the traps small enough to fit a rat. [substeps] Once you have created the trigger of the traps, throw the cardboard pieces away and replace them with strips of cardboard or poster board.

Answer format: ending1/ending2/ending3/ending4