How is UPSR and BLSR traffic rerouted during a protection switch when a complete fiber cable cut occurs?（）

• A、Traffic is switched from the first node receiving the AIS indication.
• B、Traffic is switched from the far side of the failure, allowing handshaking to occur.
• C、UPSR traffic is switched from the terminating node, BLSR traffic is rerouted from the originating node in the ring.
• D、UPSR traffic is switched from the terminating node, circuit by circuit. BLSR traffic is rerouted from the last reachable node in the ring.