Final answer:
O.S.H.A. requires retrieval lines and fall restraint when vertical entries of 8 feet or more are made.
Step-by-step explanation:
The subject of this question is Health.
O.S.H.A. (Occupational Safety and Health Administration) requires retrieval lines and fall restraint when vertical entries of 8 feet or more are made.
The primary topic of this question is fall protection and safety regulations in the workplace.