Virtual PortChannels （vPCs） allow links that are physically connected to two different Cisco switches to appear to a third downstream device as coming from a single device and as part of a single port channel. Which of the following are components of a Virtual PortChannel system？ （）

• A、 Two peer devices： the vPC peers of which one is primary and one is secondary and are part of a vPC domain.
• B、 A Layer 3 Gigabit Ethernet link called peer-keepalive link to resolve dual-active scenarios
• C、 A redundant 10 Gigabit Ethernet PortChannel called a peer link to carry traffic from one system to the other when needed
• D、 vPC member ports forming the PortChannel
• E、 A dot1q trunk between the vPC peers
• F、 A management port that can be used as peer-keepalive link to resolve dual-active scenarios.