The correct answer would be, at scaffold 10 feet above the lower level.
The employer must provide a guardrail if workers are working at scaffold 10 feet above the lower level.
Explanation:
A scaffold is a temporary arrangement or a temporary structure which provides aid to workers who work at height.
An employer must ensure the safety of his employees and must implement proper safety measures when workers are working in an unsafe environment.
It is usually unsafe for workers who are working at height with scaffolding. The employer must provide a guardrail if the employees are working at scaffold 10 feet above the lower ground. This will ensure the safety of the employees and will minimize the likelihood of falling from the height.
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