An administrator has a requirement to add user authentication to the ZTNA access for remote or off-fabric users. Which FortiGate feature is required in addition...

An administrator has a requirement to add user authentication to the ZTNA access for remote or off-fabric users.
Which FortiGate feature is required in addition to ZTNA?

A. FortiGate endpoint control B. FortiGate certificates C. FortiGate FSSO D. FortiGate explicit proxy