Final answer:
Standard fall protection is mandatory at heights of 6 feet or higher above a lower level. This protection includes measures such as guardrails, safety nets, or personal fall arrest systems to prevent falls.
Step-by-step explanation:
The question is regarding the mandatory standard fall protection for unprotected sides and edges at a certain height above a lower level in the context of workplace safety. In this scenario, it is crucial to maintain safe practices when objects are at risk of falling. According to Occupational Safety and Health Administration (OSHA) regulations, standard fall protection is required when working at heights of 6 feet (Option 2) or higher above a lower level. When working at such heights, it is vital to use guardrails, safety nets, or personal fall arrest systems to prevent workers from falling and sustaining injuries.