If an edge Label Switch Router （LSR） is properly configured，which three combinations are possible？（）

• A、A received IP packet is forwarded based on the IP destination address and the packet is sent as an IP packet.
• B、An IP destination exists in the IP forwarding table. A received labeled packet is dropped because the label is not found in the LFIB table.
• C、There is an MPLS label-switched path toward the destination. A received IP packet is dropped because the destination is not found in the IP forwarding table.
• D、A received IP packet is forwarded based on the IP destination address and the packet is sent as a labeled packet.
• E、A received labeled IP packet is forwarded based upon both the label and the IP address.
• F、A received labeled packet is forwarded based on the label. After the label is swapped，the newly labeled packet is sent.