A domestic U.S. flight is oversold. According to Department of Transportation (DOT) regulations, what is the first action a customer service agent must take?
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A
Deny boarding to the passengers who checked in last.
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B
Offer travel vouchers to passengers who are involuntarily denied boarding.
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C
Ask for volunteers to give up their seats in exchange for compensation.
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D
Upgrade the highest-status frequent flyers to first class to create space.