A . A、B2C(business-to-consumer)、B2B(business-to-business)B . B、B2C(business-to-consumer)、C2C(consumer-to-consumer)C . C、P2B(person-to-business)、C2C(consumer-to-consumer)D . D、P2B(person-to-business)、B2B(business-to-business)
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