题目：AsystemadministratorwillbemigratingaserverfromAIX5.1toAIX5.2andisuncertainiftheapplicationrunningontheserverwillfunctionproperlyafterthemigration.WhatisthefastestwaytoreturntothepreviousAIXleveliftheapplicationdoesnotwork？（）
A.UsebasemediatorestoresystemtoAIX5.1.
B.Useanalt_disk_installandbootbacktotheAIX5.1rootvg.
C.MakeamksysboftheoriginalAIXtorestorebacktotheAIX5.1level.
D.PerformtheAIX5.2upgradeusingupdate_allwiththecommitoptionandrejectfilesetstoreturntoAIX5.1.
A：1toAIX5.2andisuncertainiftheapplicationrunningontheserverwillfunctionproperlyafterthemigration.WhatisthefastestwaytoreturntothepreviousAIXleveliftheapplicationdoesnotwork？（）
B：UsebasemediatorestoresystemtoAIX5.1.
C：Useanalt_disk_installandbootbacktotheAIX5.1rootvg.
D：MakeamksysboftheoriginalAIXtorestorebacktotheAIX5.1level.
E：PerformtheAIX5.2upgradeusingupdate_allwiththecommitoptionandrejectfilesetstoreturntoAIX5.1.
