Please choose the correct ending to complete the given sentence: Health: [header] How to measure a wheelchair [title] Measure the width of the person who will use the wheelchair. [step] Take the measurement with the person in the seated position, on a fairly firm surface. This will determine the width of the seat.

Ending1: [title] Measure the height and length of the wheelchair. [step] Use a tape measure to measure the upper surface of the seat and a section of the underside. Ending2: [substeps] Spread the person's arms so they are parallel to the ground. Put a person's hands on top of the chair. Ending3: You can use a tape measure, or measure with a ruler. If you have a computer, or don't have the equipment right away, convert the measurement to a spreadsheet. Ending4: [substeps] Add approximately 1 to 2 inches (2.5 to 5 cm) for slight movement and comfort when sitting. Allow for the thickness of bulky clothing, which could be worn in the winter.

Answer format: ending1/ending2/ending3/ending4