The operation sequence of the line power outage is ( ).

A、FirstbreakthebusQS,thenbreakthelineQS,finallytheQ
F、;
B、FirstbreakthelineQS,thenbreakthebusQS,finallytheQ
F、;
C、FirstbreaktheQF,thenbreakthelineQS,finallythebusQS.;
D、FirstbreaktheQF,thenbreakthebusQS,finallythelineQS.