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sliding window [optimal window size]

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Station ‘A’ uses 64 Byte packets to transmit messages to station ‘B’ using a sling window protocol. The round trip delay between A and B is 80 milliseconds and the bottleneck bandwidth on the path between ‘A’ and ‘B’ is 128 Kbps. What is the sender window size for maximum efficiency?

if solved by (Tx+2Tp)/Tx answer=21

if solved by RTT*BW,optimal window size 1+2a=121

which one is correct method to solve?
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