When deploying GP ON Type C single-homing protection, which of the following description is correct?

When deploying GP ON Type C single-homing protection, which of the following description is correct?
A . A branch fiber break occurs, and the status of the work port of the OLT becomes standby
B . The two ports protected on the OLT side cannot send and receive data at the same time
C . When the olt uplink fails, protection switching can be triggered
D . The service configuration of ONU access is the same as the configuration before protection

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Answer: B