Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to amuse cats [title] Create a " cat tree. [step] " cats love to observe and hunt for small animals. Build a " cat tree " near a window so that your cat can observe birds, squirrels and other small creatures.

Ending1: Many cat trees also feature a kitchen, an entrance to a den and can be used in a variety of ways. [substeps] Before building a cat tree, prop the tree upright. Ending2: Use cinder blocks, cardboard, or boxes to build your tree in relation to or opposite of a window so that your cat associates its perch on the tree. [substeps] Choose cardboard boxes so that your cat can fold the box when she eats. Ending3: [title] Decide on a base for the tree. [step] The base should be large enough for the cat to reach all the way to the top. Ending4: This may be an especially great way to amuse indoor cats, or outdoor cats that may be inside. [substeps] Construct your " cat tree " from items around the house or build an actual structure with different level platforms and perches.

Answer format: ending1/ending2/ending3/ending4