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You issued the following command： ALTER DATABASE ENABLE BLOCK CHANGE TRACKING；  What will be the result of issuing this command？（）
A: The block change tracking feature is enabled， and the information about the system change number is written in the change tracking file.
B: The block change tracking feature is enabled， and the information about the log sequence number is written in the change tracking file.
C: The block change tracking feature is enabled， and the information about the blocks that are changed since the last backup is written in the change tracking file.
D: The block change tracking feature is enabled， and the information about the locations of the datafiles and the online redo log files are written in the change tracking file.

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出自：Oracle认证

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