The correct answer is Hardware Security Module (HSM). An HSM is a physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing. It is resistant to tampering and integrates with existing systems to facilitate secure boot, disk encryption, and digital rights management, fitting the company's needs. Trusted Platform Module (TPM) is also dedicated hardware designed to protect hardware through integrated cryptographic keys, but it is typically used for securing individual computers rather than for managing keys across an organization. Secure Enclave provides hardware-based key management, primarily in mobile devices, and is less suitable for enterprise-scale key management and lacks the full functionality of an HSM. Lastly, Key Management System is a more general term for systems that manage cryptographic keys; however, it doesn't specify resistance to physical tampering or integration capabilities needed for secure boot or digital rights management, which an HSM provides.