下列哪項(xiàng)中是數(shù)據(jù)庫(kù)中涉及安全保密的主要問(wèn)題()?A、訪問(wèn)控制問(wèn)題 B、數(shù)據(jù)的準(zhǔn)確性問(wèn)題 C、數(shù)據(jù)庫(kù)的完整性問(wèn)題 D、數(shù)據(jù)庫(kù)的安全性問(wèn)題