Tri-Secret Secure refers to customer-managed encryption keys used to protect data at rest.

• A. A feature for multi-region replication
• B. A feature to manage customer encryption keys
• C. A feature for automatic query acceleration
• D. A feature for passwordless authentication

Answer: (B)

Tri-Secret Secure centers on encryption key management for data at rest. It enables you to bring and manage your own encryption keys through a Key Management Service, adding control over how data is encrypted and decrypted beyond what the provider manages alone. This makes it a feature specifically about handling customer encryption keys. The other ideas described are about different capabilities—not encryption key control: multi-region replication concerns where data is stored, automatic query acceleration relates to performance, and passwordless authentication deals with how users access the system.