Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to play with cats [title] Activate your cat's natural hunting instinct. [step] Get your cat to stalk a rope, a wind-up toy, or a fluffy or feathered toy tied to a string. A piece of string with something fluffy attached to it is one of the simplest toys that you can make, and it is also one of the most effective.

Ending1: If you can't mimic your cat's natural hunting instincts, be open to trying another one, too. [substeps] This approach is particularly effective because cats are less aggressive with prey they are familiar with. Ending2: [substeps] Get rubber bands specifically made for your cat's natural hunting instincts. These will hold the string together so that your cat cannot accidentally grab it. Ending3: Use an old stuffed animal that you don't mind letting a cat chew on. Try to find objects that are smaller than your cat, roughly the size of its natural prey (small birds and rodents). Ending4: [substeps] Start to feed your cat the string/toy at least ten times. You can feed the cat based on the amount of time it has spent on it.

Answer format: ending1/ending2/ending3/ending4