Please choose the correct ending to complete the given sentence: Work World: [header] How to select an ergonomic office chair [title] Understand the importance of having chairs that are ergonomic. [step] Ergonomic chairs help to reduce back problems, pain in the shoulders and neck and give better support to someone who uses it throughout the whole day. [title] Check the height.

Ending1: [step] Having a chair that is too low, too high or too high can lead to back injuries and stiff joints. [title] Consider the seat size and how comfortable you feel in the chair. Ending2: [step] Some ergonomic chairs require that employees sit straight up at a 90 degree angle to support their shoulders while sitting. Some chairs are taller with a height of 24 to 27 inches. Ending3: [step] Your chair height will determine how much recommended support you need to get while sitting and standing. But, if you choose chairs that are somewhat elevated or are high on a table, they should not get so high that they irritate or sabotage your back. Ending4: [step] Ergonomic office chairs should have a height adjustable seat. Not everybody is one size so look for the chairs that have those levers under them that allow for the proper adjustments.

Answer format: ending1/ending2/ending3/ending4