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