单项选择题

WhyisanSTM－12F－MS－SPRingNOTfeasible？（）

A.Anequalamountofworkingandprotectbandwidthisrequired.
B.DCCbandwidthisnotlargeenoughtohandleK1/K2processing.
C.Switchtimeswouldexceed50msforanSTM-1MS-SPRingring.
D.ThereisnotenoughbandwidthinanSTM-1ringtojustifyMS-SPRingprotection.

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