Which option describes the incorrect usage of the Label Distribution method？（）

• A、LDP is primarily used in internal networks of MPLS-VPN providers.
• B、MP-BGP is used for label distribution for VPN customer routes.
• C、Directed LDP is used for label distribution in L2-VPN Attachement Circuits.
• D、MP-BGP is used for label distribution in MPLS Traffic Engineered networks.