User A and User B belong to different city servers, and there is only one landline in both homes that can be used for conversation. If user A is calling user B, the number of transactions included in the entire conversation is?

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User A and User B belong to different city servers, and there is only one landline in both homes that can be used for conversation. If user A is calling user B, the number of transactions included in the entire conversation is?
A . 4
B . 3
C . 5
D . 6

Answer: A

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