Which three statements about the route target （RT） are true？ （）

• A、The RT is a BGP extended community.
• B、The RT is an 8-byte field that is prefixed to an IPv4 address to make it a unique VPNv4 address.
• C、When a VPN route that is learned from a CE router is injected into BGP， one or more RTs are associated with it
• D、The distribution of VPN routing information is controlled through the use of VPN RTs
• E、When a VPN route that is learned from a CE router is injected into BGP， there is always one RT that is associated with it.