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Which of the following is not a requirement for an accessible washroom 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 washroom in a commercial building must have grab bars, a barrier-free entrance, and a sink with knee clearance to accommodate individuals with mobility disabilities. A bathtub with a built-in seat does not meet the requirement for an accessible washroom because it may still pose difficulties for someone with limited mobility. The other options are necessary to ensure that the washroom is accessible to all individuals.