A TCP/IP Transfer is diagrammed in the exhibit.A window size of three has been negotiated for this transfer. Which message will be returned from the receiver to the sender as part of this TCP/IP transfer?（） 
- A、Send ACK 1-3
- B、Send ACK 3
- C、Send ACK 4
- D、Send ACK 4-6
- E、Send ACK 6
- F、Send ACK 7
正确答案:C
答案解析:有
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