Phone A has been successfully registered to the U1900 system. At some point, unplug the network cable. At this time, log in to the U1900 system to check the registration status of phone A. The following statement is wrong ()

Phone A has been successfully registered to the U1900 system. At some point, unplug the network cable. At this time, log in to the U1900 system to check the registration status of phone A. The following statement is wrong ()

A. The registration status of phone A in the U1900 system may change immediately

B. The registration status of phone A in the U1900 system may remain unchanged

C. The registration status of phone A in the U1900 system may change after a period of time

D. The registration status of phone A in the U1900 system is updated, only after the network cable of phone A is unplugged, the change occurs after half of the registration period of phone A has passed

Answer: D