Question

what is designed to catch a person and break his or her fall, and must be placed directly below the working surface, if possible, but never more than 30 feet below? options (from image): guardrail, (possibly misspelled rigth), safety net system, personal fall arrest system

Explanation:

A Safety Net System is designed to catch a person and break their fall. It's placed below the working surface, max 30 feet below. Guardrail prevents falls, Personal Fall Arrest System stops falls during, “Right” is not a safety device.

Answer:

Safety Net System