（单选题）
What does the SCN represent？（）
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.
正确答案
答案解析
略
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