Which four requirements are mandatory to enable a mixed mode Cisco Unified CM cluster? (Choose four.)

The Cisco CTL Provider Service must be activated and enabled to manage the Certificate Trust List (CTL), which is essential for secure communication in mixed mode.

The Cisco Certificate Authority Proxy Function (CAPF) must be activated and enabled to issue and manage certificates for devices, critical for authentication and encryption in mixed mode.

Cisco Trust Verification is a security feature but not a mandatory requirement specifically for enabling mixed mode.

The Cisco CTL client is required to generate and update the CTL file, which contains security parameters and must be pushed to IP phones and other devices for secure operation in mixed mode.

A minimum of two USB e-tokens are required for redundancy and security, not just one.

A minimum of two USB e-tokens are required to generate and sign the CTL file securely, ensuring redundancy and a split-key approach for enhanced security.

Soft e-tokens are not used for generating the CTL file for mixed mode; physical USB e-tokens are mandatory.