Which of the following descriptions of PM_BIP8 related alarms is correct?

Which of the following descriptions of PM_BIP8 related alarms is correct?
A . The PM_BIP8_DEG alarm indicates a signal degradation alarm in the PM segment of the ODU layer.
B . The PM_BIP8_SD alarm indicates the signal degradation alarm of the PM segment at the OTU layer.
C . The PM_BIP8_OVER alarm indicates the ODU layer PM error amount over-limit alarm.

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Answer: C