Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to prevent feline high rise syndrome [title] Secure your windows. [step] If you frequently open your windows, install window screens. These should fit snugly over the window, so there are no gaps.

Ending1: [title] Install permethrin on windows windows. [step] Permethrin is an industrial pesticide and kills bacteria. Ending2: They shouldn't break while you are outdoors, or fly in during high heat, or ever. [substeps] You should also install window screens in your home, so there are at least two ways you can look out of the window. Ending3: [title] Give your windows more perm by using glass cabinets. [step] They can be easily installed one; however, the cabinets are usually really tight. Ending4: Screens allow you to keep the windows open, but prevent your cat from falling out of the windows. [substeps] If you rent your home and can't install screens, consider purchasing an adjustable screen insert that will fit into the open window.

Answer format: ending1/ending2/ending3/ending4