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Which of the following is true of Ethernet half-duplex transmission?

Which of the following is true of Ethernet half-duplex transmission?
A . Half-duplex transmission is less efficient because the frame MTU is smaller.
B . Half-duplex transmission is only 30-40% efficient because of collisions.
C . Ethernet switches support half-duplex transmission only.
D . All of the above.

Answer: B

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