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