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What is the minimum height required for a guardrail on a stairway in a commercial building?

  1. 750 mm

  2. 850 mm

  3. 950 mm

  4. 1050 mm

The correct answer is: 850 mm

The minimum height required for a guardrail on a stairway in a commercial building is 850 mm. This is because building codes and regulations typically require a guardrail to be at least 42 inches high, which is equivalent to 1065 mm. Among the given options, only 850 mm meets this height requirement. Options A, C, and D are not correct as they fall below the minimum height requirement.