The command set in Option C is the correct configuration for a Fibre Channel port channel on a Cisco Nexus 9000 Series Switch that meets the specified requirements. The commands in this option perform port-channel protocol negotiation with peer ports using the "channel mode active" command, explicitly configure the trunk mode with "switchport trunk mode on," and allow VSANs from 10 to 20 with "switchport trunk allowed vsan 10-20." References: For further details, you would refer to the Cisco Nexus 9000 Series NX-OS SAN Switching Configuration Guide, which provides instructions on configuring Fibre Channel port channels and related settings.