I think the key here is that packet filtering routers are used in low-risk environments, so they don't need the strongest security features. That makes me think B is the best answer - they protect against IP spoofing, which is important, but they don't have the overhead of strong user authentication.
This looks like a straightforward problem, I think I can handle it. I'll start by identifying the highest OrderTotal value and then use an Excel function to return that value in cell J2.
Brock
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