Under 49 CFR Part 40, if an MRO cannot reach a donor within 24 hours of a non-negative laboratory result, what is the MRO's next required action?
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A
Report the positive result directly to the employer's DER immediately
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B
Attempt contact by certified mail and wait 5 business days
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C
Contact the DER to ensure the employee calls the MRO within 72 hours
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D
Cancel the test and require a new collection