单选题

You are maintaining the PROD database of TeleSoft Corporation. You have initialized the following DB_BLOCK_CHECKING parameter in the init.ora file:  DB_BLOCK_CHECKING = TRUE;  What will be the result of setting this parameter?()

A Only data blocks of the SYSTEM tablespace will be checked.

B Only data blocks of the SYSAUX tablespace will be checked.

C A checksum will occur only on the checkpoint.

D A checksum will occur every time a block is modified.

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