What does Assigned Protection Factor (APF) mean and how is it used?

What does Assigned Protection Factor (APF) mean and how is it used?

• A. PF Representing The Expected Level Of Respiratory Protection; Used To Select Respirators To Meet Exposure Controls
• B. PF Represents The Filtration Particle Efficiency; Used To Size The Mask
• C. PF Represents The Airflow Rate; Used To Determine Filter Change Intervals
• D. PF Represents Protection Factor Of Hearing Equipment; Used To Select Hearing Protection

Answer: (A)