If there is no T1 gateway the right answer should be B and C. A mentions of an intra-tier, but this one is present only when there is a T0 and a T1 gateway connected to each other and the question mentions single tier topology. D. Tier-1 SR Router Port mentions of a T1 but again this is a single tier configuration.
D and E would be another good answer if the traffic is East-West/lateral between VMs connected to two different Overlay Segments.
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GopalSrinivasan
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