The correct service, Key Management Service, provides a centralized control point for managing cryptographic keys. It integrates with various storage and database services to enable the encryption of data at rest. The service also allows for the implementation of automatic key rotation, helping maintain security compliance. Elastic Compute Cloud deals with compute capacity and utilizes encryption keys but does not manage them. Identity and Access Management is focused on managing identities and permissions, not encryption keys. Simple Storage Service offers data storage and also supports encryption but by itself does not manage the keys used for encrypting data.