The DB_BLOCK_CHECKING initialization parameter is set to OFF.Which block checking would be performed?（）

• A、The Oracle database will perform block checking for the index blocks only
• B、The Oracle database will not perform block checking for any of the data blocks
• C、The Oracle database will perform block checking for the default permanent tablespace only
• D、The Oracle database will perform block checking for the data blocks in all user tablespaces
• E、The Oracle database will perform block checking for the data blocks in the SYSTEM tablespace only