If the level of airborne lead at a work site is equal to or higher than the PEL, which of the following is true? A. The employer should try to reduce the level of airborne lead through engineering controls or work practice controls before exposing workers and issuing respirators to employees. B. The employer should issue respirators to workers before trying to reduce the level of airborne lead through work practice controls. C. The employer should issue respirators to workers instead of trying to reduce the level of airborne lead through engineering controls. D. The employer should immediately issue respirators to workers.