If a SONET/SDH interface transmit link fails between two JUNOS devices, which two alarms or defects would be seen on those devices?（）

A.Traffic that does not match any route in the forwarding table.
B.Traffic that exceeds the bandwidth of the interface.
C.Traffic of unsupported protocols on that interface.
D.Traffic arriving on unknown virtual-circuits on that interface.

A.ps -x
B.passwd
C.ls -a-l
D.tcpdump

A.user@host> debug interface interface-name
B.user@host> monitor usage interface-name
C.user@host> monitor interface interface-name
D.user@host> traceoptions interface interface-name