Final answer:
TPM (Trusted Platform Module) is the best solution to manage encryption keys, passwords, drive encryption, and digital rights for users on client computers.
Step-by-step explanation:
The best solution to manage encryption keys, passwords, drive encryption, and digital rights for users on client computers is TPM (Trusted Platform Module). TPM is a hardware-based security solution that stores sensitive data such as encryption keys securely. It provides a secure environment that helps prevent unauthorized access to data on client computers. TPM can be used for various security applications, including disk encryption, user authentication, and digital rights management.