Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to build a dog barrier for your vehicle [title] Measure your vehicle's interior. [step] The size of your dog barrier will depend on the floor-to-ceiling and wall-to-wall lengths of your vehicle's trunk area. If your vehicle has collapsible back seats, you have the choice of placing the barrier just behind the front seats.

Ending1: If you have a door-to-roof barrier, you can measure this distance and make sure it is in need of repairs. [substeps] If the doors of the car are not out of place, you can measure them at your local hardware store. Ending2: In this case, run a tape measure from the floor just behind the front seats up to the ceiling. Otherwise, just measure the floor-to-ceiling height of the trunk area behind the back seats. Ending3: [substeps] Measure out several components (for small vehicles, car piers, etc. ) that may not be able to reach the car. Ending4: If it has collapsible front seats, place the barrier in front of the rear doors. [substeps] If you have wide aisles, you can support this barrier with your trunk/deck metal.

Answer format: ending1/ending2/ending3/ending4