单项选择题

A.inter-connection enable
B.crc-auto enable
C.batch-e1 enable
D.batch loopback-detection enable

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A.batch-e1 1-63 unframed
B.batch virtual-channel vc121-63 e1 1-63
C.batch-e1 1-63 framed
D.batch loopback-detection 1-63

A.enable
B.config
C.display
D.show