In troubleshooting MPLS VPN networks, if "MPLS LSPs have been established between PE devices, but VPN data still cannot be transmitted," which of the following troubleshooting steps should be performed first?

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A. Check if the binding relationship between the VPN instance and the interface on the PE device is

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B. Check if the MPLS protocol configuration on the P device is correct.

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C. Check if the IP address of the CE device is configured correctly.

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D. Check if the BGP VPNv4 neighbor between PE devices is established normally.

In troubleshooting MPLS VPN networks, if "MPLS LSPs have been established between PE devices, but VPN data still cannot be transmitted," which of the following troubleshooting steps should be…

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