Okay, let me think this through. We need to enable LDP-over-RSVP, so that rules out A. And we need to configure the RSVP-TE LSPs and LDP sessions, so that leaves B, C, and D. I'm leaning towards D, since the question is asking what's not required, and T-LDP sessions with tunneling don't seem directly related to LDP-over-RSVP.
Gary
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