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.