The DB_BLOCK_CHECKINGinitialization parameter is set to TRUE. What would be the result of this setting on the data blocks being written to the datafiles， every time the DBWn writes？（）

• A、 The Oracle database will check all data blocks by going through the data on each block， making sure the data is self-consistent.
• B、 The DBWn and the direct loader will calculate a checksum and store it in the cache header of every data block when writing it to disk.
• C、 The Oracle database will check data blocks belonging to the SYSTEM tablespace only， by going through the data on each block， making sure the data is self-consistent.
• D、 The Oracle database will check data blocks belonging to the SYSAUX tablespace only， by going through the data on each block， making sure the data is self-consistent.
• E、 The Oracle database will check data blocks in the SYSTEM and SYSAUX tablespaces only， by going through the data on each block， making sure the data is self-consistent.