A . [Quidway] ip addresss erial0/0/1 equal loopback0
B . [Quidway-serial0/0/1] ip addresss erial0/0/1 equa lloopback0
C . [Quidway] ip address unnumbered interfaceserial0/0/1 loopback0
D . [Quidway-serial0/0/1] ip address unnumbered interface loopback0
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