问题:
A . The system change number, which is a point in time relative to transactions within a given database.
B . A number that represents time. Thus, at 1300 hours, the SCN is the same on all databases.
C . The security change number, which represents the security code that is needed to access any database structure.
D . A conversion factor that converts internal database time to external clock time.
E . UTC time in the database,providing a standardized way of tracking time in Oracle.
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