A.Theinstancestarts，thedatabaseismounted，buteffortstoopenthedatabasefail，andanerroraboutthemissingredologgroupisdisplayed.
B.Beforetheinstancestarts，youreceiveanerroraboutthemissingredologfilesofagroup.
C.Theinstancestartsandthedatabaseopenswithanerrormessagewrittentothealertlogfile.
D.Theinstancestartsandthedatabaseopensbecausetworedologgroupsstillexist.
E.Theinstancestartsandthedatabaseopens，buteveryattempttowritetoredologfilesfailswithanerror.
正确答案：参考A
