數(shù)據字典主要包括（    ）幾個部分
A．數(shù)據項、數(shù)據結構、數(shù)據流、數(shù)據存儲、處理過程等
B．數(shù)據項、數(shù)據收集、數(shù)據流、數(shù)據驗證、數(shù)據保密等
C．數(shù)據項、數(shù)據收集、數(shù)據流、數(shù)據存儲、處理過程等
D．數(shù)據項、數(shù)據結構、數(shù)據流、數(shù)據驗證、數(shù)據保密等