What other two main functions of the root encryption keys?

SAP HANA uses SSFS to protect the root encryption keys. These root keys protect all encryption keys used in the SAP HANA database from unauthorized access.

What other two main functions of the root encryption keys? There are 2 correct answers to this question.
A . The root key used for the internal data encryption service of the database
B . The root key used for data volume encryption
C . The root key used for users log encryption
D . The root key used for transactions volume encryption

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Answer: A,B