When implementing CSC services, which two methods can be used to exchange label information between the downstream CSC customer carrier and the CSC backbone carrier? (Choose two.)

When implementing CSC services, which two methods can be used to exchange label information between the downstream CSC customer carrier and the CSC backbone carrier? (Choose two.)
A . using MP-BGP
B . using RSVP
C . using IGP and LDP
D . using back-to-back VRF
E . using front VRF and internal VRF

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Answer: A,C