An organization recently implemented a transparent Cisco FTD in their network. They must ensure that the device does not respond to insecure SSL/TLS protocols. Which action accomplishes this task?

Modifying 'device's settings using the device management feature' is too generic; the platform policy is the specific and correct mechanism for this configuration.

The Cisco FTD platform policy within Cisco FMC allows administrators to define global device settings, including cryptographic standards and the minimum acceptable SSL/TLS version. By setting the minimum SSL version to TLS 1.2 or higher, the FTD device's own management interfaces and potentially other SSL-enabled services will reject connections or responses using older, insecure protocols.

Enabling UCAPL/CC compliance indicates adherence to standards but does not directly configure the specific SSL/TLS versions on the device; specific settings are made via policy.

While FlexConfig can apply custom CLI, the platform policy offers a native, supported, and integrated way to manage SSL/TLS versions for the FTD device.