Haha, this question is a real brain-teaser. I'm just going to go with my gut and choose A, B, and D. Who needs a Trunk Group for NCA TSC anyway? That's so last year.
I think the correct answer is B, D, and E. The question is asking for the three requirements for BSR polling over IP without the B-channel signaling-group, and those options seem to fit the bill.
Samira
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