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Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet？（）

A. Full-duplex Ethernet uses CSMA/CD to prevent collisions.

B. Half-duplex Ethernet uses a loopback circuit to detect collisions.

C. A full-duplex Ethernet card allows 20Mbps for data transmission.

D. Full-duplex Ethernet makes use of two pairs of wires for data.

E. An Ethernet hub can operate both half and full duplex simultaneously.

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