题目内容（请给出正确答案）

[主观题]

What protection method is used in 4F BLSR networks？（）

A. Each fiber has half of its SONET capacity reserved for protection.

B. Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection.

C. The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.

D. The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.

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