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What is the status of client B?

As a normal three-way handshake mechanism system A sends an ACK packet to system B.

However, system A does not send an ACK packet to system B. In this case, client B is waiting for an ACK packet from client A.

What is the status of client B?

A. “Half-open”

B. “Filtered”

C. “Half-closed”

D. “Full-open”

Answer: A