As described by the CSMA/CD algorithm, what is the first thing to happen when Host A and Host B begin transmitting data at the same time?

As described by the CSMA/CD algorithm, what is the first thing to happen when Host A and Host B begin transmitting data at the same time?
A . Host A and B will generate a jam signal.
B . Listening hosts will request retransmission.
C . Host A or B will retry the transmission.
D . A back-off timer is started by Host A or

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Answer: A