A financial services company uses Amazon RDS for Oracle with Transparent Data Encryption (TDE). The company is required to encrypt its data at rest at all times. The key required to decrypt the data has to be highly available, and access to the key must be limited. As a regulatory requirement, the company must have the ability to rotate the encryption key on demand. The company must be able to make the key unusable if any potential security breaches are spotted. The company also needs to accomplish these tasks with minimum overhead. What should the database administrator use to set up the encryption to meet these requirements?