As shown in the figure, a TCP connection is established between client A and server B. Which of the following two "?" packet numbers should be?

As shown in the figure, a TCP connection is established between client A and server B. Which of the following two "?" packet numbers should be?

A . a+1: a
B . a: a+1
C . b+1: b
D . a+1: a+1

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Answer: D