ENCRYPT_TS is an encrypted tablespace that contains tables with data. Which statement is true regarding the effect of queries and data manipulation language （DML） statements on the encrypted data in the tables？（）  

• A、 The data is decrypted during SORT and JOIN operations.
• B、 The data remains encrypted when it is read into memory.
• C、 The data remains encrypted when it is stored in the redo logs.
• D、 The data remains encrypted in the UNDO tablespace provided that the UNDO tablespace was created with the encryption option enabled.