A.performanexhaustivediskcheck，locatebadsectors，andrecoverreadableinformation.
B.setadiskasread-only，performanexhaustivediskcheckandrepairbadsectors.
C.scanandverifytheversionsofallprotectedsystemfilesusingthetoolsdefaultoperation.
D.consolidatefragmentedfilesandfoldersonthecomputersharddisk.
参考答案：A
