When deploying GPON Type C single-homing protection, which of the following descriptions is correct?

When deploying GPON Type C single-homing protection, which of the following descriptions is correct?
A . A branch fiber breaks, and the status of the OLT’s work port changes to standbyY
B. The two ports protected by 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 exactly the same as the configuration before protection

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Answer: B