Final answer:
Scaffold frames may be used as a means of access when they have secure guardrails and toeboards in place, ensuring the safety of workers and compliance with OSHA standards.
Step-by-step explanation:
The subject question pertains to the conditions under which scaffold frames may be used as a means of access for workers. According to the standards set by the Occupational Safety and Health Administration (OSHA), a scaffold must have certain safety measures in place to be considered safe for use. These measures can include having secure guardrails and toeboards, being inspected by a safety supervisor, being reinforced with additional supports, or being placed at the ground level. However, the correct answer to the question is A) Have secure guardrails and toeboards in place, which are essential for preventing workers from falling off the scaffold.
It's significant to note that OSHA's safety standards are designed to protect workers from hazards, which include not only the proper set-up of scaffolds but also practices like fall protection, preventing exposure to harmful chemicals, and ensuring the overall safety of the workplace.