A virtual port channel （vPC） allows links that are physically connected to two different Cisco Nexus devices to appear as a single port channel to a third device. Which are the mandatory steps for configuring vPC？ （）   

• A、 Enable feature vPC
• B、 Define domains
• C、 Establish peer keepalive connectivity
• D、 Create a peer link
• E、 Configure the peer link as a trunk port
• F、 Create port channels and vPCs
• G、 Define port channel load-balancing method
• H、 Make sure configurations are consistent