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單項(xiàng)選擇題

A network is composed of several VRFs. It is required that VRF users VRF_A and VRF_B be able  to route to and from VRF_C， which hosts shared services. However， traffic must not be allowed to flow between VRF_A and VRF_B. How can this be accomplished？（）

A.route redistribution
B.import and export using route descriptors
C.import and export using route targets
D.Cisco MPLS Traffic Engineering

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