Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep a pet rat clean [title] Fill the sink with an inch of warm water. [step] The water temperature should be a comfortable warm temperature similar to what you would want in a bath-not too hot and not too cold. Since rats are fairly small, you only need to fill the sink with about an inch of water for the bath.

Ending1: Fill the tap halfway full (about 80 degrees f). Then add half a cup of lukewarm (not hot) water and stir thoroughly. Ending2: [substeps] Make sure the water stays warm throughout the bath. If the water starts to cool off too quickly, add some more warm water to the bath. Ending3: [substeps] An extra inch is worth a try. If you feel unsure about how much your rat needs, remember to figure out the water temperature once you get him or her used to this water. Ending4: [title] Add a cup of epsom salt to the water. [step] To keep your rat from struggling, you'll need to pour enough salt to the warm water to cover the rat.

Answer format: ending1/ending2/ending3/ending4