12. Two masons are preparing to work on a rolling scaffolding system. Mason A says that since the scaffolding is greater than six ft high, it must have
guardrails and toe boards. Mason B says that the guardrails must be 42" from the walking surface of the scaffolding and be able to withstand 200 lb of Impact.
Which mason is correct?
A. Only Mason A is correct.
• B. Only Mason B is correct.
• C. Neither Mason A nor Mason B is correct.
• D. Both Mason A and Mason B are correct.