Which three MPLS Traffic-eng DS-TE models are defined by IETF standard? (Choose three)

Which three MPLS Traffic-eng DS-TE models are defined by IETF standard? (Choose three)
A . GRDM
B . MAR
C . MAM
D . RDM
E . G-BAM
F . A-RDM

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Answer: B, C, D