Question: In Stop - and - wait, the transmitter: Needs to maintain a copy of the acknowledgement Needs to maintain a copy of the transmitted frame

In Stop-and-wait, the transmitter:
Needs to maintain a copy of the acknowledgement
Needs to maintain a copy of the transmitted frame all the time
Does not need to maintain a copy of the transmitted frame
Needs to maintain a copy of the transmitted frame until an acknowledgment is received

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