A.受保護(hù)的審計(jì)跟蹤存儲(chǔ) B.審計(jì)數(shù)據(jù)有效性的保證 C.可能丟失數(shù)據(jù)情況下的措施 D.預(yù)防審計(jì)數(shù)據(jù)丟失