Which Azure service should you recommend to manage encryption keys for cardholder data?

Recommending Azure Key Vault Managed HSM for managing encryption keys for cardholder data is appropriate due to its design and functionality tailored for high-security key management. Azure Key Vault Managed HSM (Hardware Security Module) provides a fully managed, secure, and compliant environment for storing and managing cryptographic keys, including those used for encrypting sensitive information like cardholder data.

This service ensures that keys are not only stored securely but also comply with relevant standards and regulations, such as PCI DSS, which is crucial when dealing with payment card information. It offers enhanced security features, including hardware-backed key protection, strict access controls, and the ability to manage cryptographic operations in a secure environment. This level of security is essential for protecting sensitive data and is why it is the preferred choice for managing encryption keys related to cardholder information.

Other options, while valuable in different contexts, do not specifically cater to the robust key management and compliance needs associated with handling cardholder data encryption.