Which of the following statements is incorrect.

Which of the following statements is incorrect.
A . In the connection model of MPLS VPN, the network is composed of the backbone network of the operator and each site of the user. The so-called VPN is the division of a site set, and a VPN corresponds to a set composed of several sites.
B. The network construction of MPLS VPN is completed by the service provider. In this network structure, the service provider provides VPN services to users, and users do not feel the existence of a public network, as if they have independent network resources.
C. For the backbone routers inside the backbone network of the service provider, that is, the routers that are not directly connected to the edge routers, they do not know the existence of the VPN, and are only responsible for data transmission within the backbone network.
D. All VPN construction, connection and management work is carried out on the backbone router.

Answer: D.