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Which of the following is not required for an accessible washroom in a commercial building?

  1. Grab bars

  2. Barrier-free entrance

  3. Sink with knee clearance

  4. Shower stall with built-in seat

The correct answer is: Shower stall 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. Including a shower stall with a built-in seat would be an added feature but not a requirement. This may be beneficial for certain individuals with mobility issues, but it is not necessary for the washroom to be considered accessible.