Please choose the correct ending to complete the given sentence: Work World: [header] How to house train a pig [title] Pick a large enough litter box. [step] Like cats, pigs can be litter box trained. However, the box must be big enough so that the pig can turn around fully.

Ending1: It should also be spacious enough that the pig cannot escape, and provide plenty of light. [substeps] A simpler option is to provide other animals with a litterbox or a small bin to eat in. Ending2: Cages with small gaps are much more expensive than cages without too much space. If you want your pigs to keep moving around inside the box, you'll need to get your pig used to the size. Ending3: The proper size of litter box needs to be at least 6 inches (15 cm) high, with enough room for the pig to turn around inside and then stand on its hind legs. [substeps] A cheap litter box that cannot accommodate more than one small pig should be adequate. Ending4: That way, the pig will be able to use the bathroom comfortably. [substeps] For smaller pigs, you can use plastic storage boxes or a regular cat litter box with low sides.

Answer format: ending1/ending2/ending3/ending4