I'm leaning towards D - the present value of the positive cash flows. That seems to capture the essence of what we're trying to measure with expected value. But I'll double-check my notes just to be sure.
Okay, I think I've got this. With the protected LSP path being R1-R2-R3, and all links being equal cost, the detour LSP path for one-to-one link or node protection should be R1-R4-R5-R3. I'll select options B and D.
Gilberto
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