Question: In a Go - Back - N ( GBN ) protocol : _ _ _ _ _ _ _ _ _ _ _ _ _

In a Go-Back-N (GBN) protocol : ______________
Group of answer choices
the sender is allowed to transmit multiple packets when available without waiting for an acknowledgment.
it is constrained to have no more than some maximum allowable number, N, of unacknowledged packets in the pipeline.
a and b
none of the above

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