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. 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.