【单选题】
A client roams from h-reap ap1 to h-reap ap2. the client is unable to associate to h-reap ap2. h-reap ap2 has six other clients associated to it， which continue to pass traffic.<br /> What has caused this problem？（）
A、h-reap ap1 has reached its client limit.
B、h-reap ap2 has reached its client limit.
C、h-reap ap2 lost its connection to the controller.
D、h-reap ap1 lost its connection to the controller.
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