Under OSHA 29 CFR 1910.120, which employees are required to participate in a medical surveillance program?
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A
Only employees who have been previously exposed to hazardous substances
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B
Employees exposed to hazardous substances above action levels or PELs for 30 days or more per year, and emergency responders
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C
All employees at any facility regardless of exposure
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D
Only supervisors and managers at hazardous waste sites