Which statement is true concerning a link working in Ethernet half-duplex mode?

Which statement is true concerning a link working in Ethernet half-duplex mode?
A . A collision cannot happen.
B . When a collision happens, the two stations immediately retransmit.
C . When a collision happens, the two stations wait for a random time before retransmitting.
D . To avoid a collision, stations wait a random time before transmitting.

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Answer: C