Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to choose a cat carrier [title] Do not pick a carrier that is too big or too small. [step] Carriers that are too big will cause your cat to tumble about as your transport it. This is very uncomfortable and unsafe for your cat.

Ending1: Picking a carrier that is too small and with too many openings will strain your cat's neck and shoulders. [substeps] If you are choosing a carrier that is too small to fit your cat in, you should avoid it. Ending2: Keep your cat confined to your carrier at all times. [title] Check out how long your cat trips with you. Ending3: You need to pick a carrier that is smaller enough for your cat to get fit in it. A carrier that is too big can make your cat cross-eyed during its ride, which is always uncomfortable. Ending4: On the other hand, your cat my feel cramped inside a small carrier, which may increase the anxiety it is already feeling. [substeps] It is also hard to balance large carriers as you transport them, especially if your cat is inside.

Answer format: ending1/ending2/ending3/ending4