C If you want to use the same FortiToken for authentication on multiple FortiGate devices, you must use a central validation server, such as FortiAuthenticator.

C is the ideal response

C. The administrator must use a FortiAuthenticator device. FortiGate Security 7.2 Study Guide (p.150): "You cannot register the same FortiToken on more than one FortiGate. If you want to use the same FortiToken for authentication on multiple FortiGate devices, you must use a central validation server, such as FortiAuthenticator. In that case, FortiTokens are registered and assigned to users on FortiAuthenticator, and FortiGate uses FortiAuthenticator as its validation server." Reference and download study guide: https://ebin.pub/fortinet-fortigate-security-study-guide-for-fortios-72.html

Answer is C FortiGate Security 7.2 Study Guide page 150

The answer is C