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.