Hmm, this is a tricky one. I'm leaning towards option C, though. If the 'red' admin group is a constraint, then R1 might not be able to find a path that meets it.
I'd go with option D. If the link between R4 and R6 is configured with the 'red' admin group, then R4 will detect that no path can meet the constraints and the LSP will go down.
Ressie
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