Oracle OCP 1Z0-053 Q291(encrypted tablespace&redo logs)

291.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.
Answer: C

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