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Which of the following is not a requirement for an accessible toilet in a commercial building?

  1. Grab bars

  2. Barrier-free entrance

  3. Sink with knee clearance

  4. Bathtub with built-in seat

The correct answer is: Bathtub with built-in seat

An accessible toilet in a commercial building must have grab bars, a barrier-free entrance, and a sink with knee clearance. This allows individuals with mobility disabilities to easily enter and use the restroom. Option D, a bathtub with a built-in seat, is not a requirement for an accessible toilet. This is because most individuals with mobility disabilities cannot use a bathtub, and it would take up too much space in the restroom. Additionally, a built-in seat in a bathtub can pose a safety hazard for individuals with mobility disabilities. Therefore, option D is not a requirement for an accessible toilet in a commercial building.