Under which circumstance may an IRB grant a waiver of informed consent for research involving human subjects?
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A
The research involves greater than minimal risk but the investigator prefers not to obtain consent
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B
The research could not practicably be carried out without the waiver, involves minimal risk, and will not adversely affect subjects' rights or welfare
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C
The sponsor has determined that consent is unnecessary for operational efficiency
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D
The IRB chair has sole authority to waive consent without full board review