Which statement about the enabling of table compression in Oracle Database 11g is true？（）
- A Compression can be enabled at the table， tablespace， or partition level for direct loads only.
- B Compression can be enabled only at the table level for both direct loads and conventional DML.
- C Compression can be enabled at the table， tablespace， or partition level for conventional DML only.
- D Compression can be enabled at the table， tablespace， or partition level for both direct loads and conventional DML.