A network administrator must create an EtherChannel interface on a new Cisco Firepower 9300 appliance registered with an FMC for high availability. Where must the administrator create the EtherChannel

The FMC GUI is used to configure FTD logical device settings, security policies, and network configurations, but not the underlying physical or aggregated interfaces like EtherChannel on the 9300 platform directly.

The FMC CLI is primarily for managing the FMC itself, not for configuring interfaces on managed devices like the Firepower 9300.

The FTD CLI is used for specific FTD troubleshooting and advanced configurations, but physical interface aggregation like EtherChannel on a 9300 is an FXOS-level function.

For Cisco Firepower 9300 series appliances, fundamental hardware-level configurations like EtherChannel must be created at the FXOS (Firepower Extensible Operating System) CLI. After creation in FXOS, these EtherChannel interfaces can then be assigned to the FTD logical device and further configured via FMC.