Which feature of OCI Block Volume ensures customer data is encrypted at rest?

The feature of OCI Block Volume that ensures customer data is encrypted at rest is primarily represented by the use of the Advanced Encryption Standard (AES) algorithm. This algorithm is a widely adopted standard for encryption and provides a robust means of securing data. When Oracle implements AES for Block Volumes, it encrypts data at rest using this well-established standard, ensuring that unauthorized access to the raw data is effectively mitigated.

While other options may relate to aspects of encryption, such as key management possibilities or additional functionalities, they do not specifically denote the encryption mechanism used for data at rest like the AES algorithm does. AES is recognized for its strength and efficiency, making it an essential component of data protection strategies within OCI Block Volume. Consequently, the implementation of AES is a foundational element that assures customers that their data is encrypted and secure when stored in the cloud.