An enterprise customers deployed two U1981 for dual-standby in the headquarters, and in the A and B place branches respectively deployed a U1960 as a local gateway. One day, because the operator network fault, A place U1960 can’t detect the heartbeat of standby U1981, but B place U1960 and standby U1981 connection is normal, then ( ).

An enterprise customers deployed two U1981 for dual-standby in the headquarters, and in the A and B place branches respectively deployed a U1960 as a local gateway. One day, because the operator network fault, A place U1960 can’t detect the heartbeat of standby U1981, but B place U1960 and standby U1981 connection is normal, then ( ).
A . At this time the master node starts master-to-slave shift
B . At this point A place U1960 local regeneration occurs
C . At this point B place U1960 local regeneration occurs
D . compared to pre-fault, no change

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Answer: B