Your boss at Certkiller .com wants you to clarify Oracle 10g. Which two statements regarding the LOGGING clause of the CREATE TABLESPACE... statement are correcte？（）

• A、This clause is not valid for a temporary or undotablespace.
• B、If thetablespaceis in the NOLOGGING mode， no operation on thetablespacewill generate redo.
• C、Thetablespacewill be IntheNOLOGGING mode by default， if not specified while creating atablespace.
• D、Thetablespace-level logging attribute can be overridden by logging specification at the table， index， materialized view， materialized view log， and partition levels.