Mercifully, this is an easy question. The computer which received the first transfer didn’t receive it from any other computer on the network.
This eliminates R, S, Q and P. From our setup diagram, those all received a transfer from another computer on the network:
(If this didn’t make sense, another way of putting it is that any letter on the right side of a line is disqualified)
That leaves only T or U as possibilities. So, E is CORRECT.
This question also gives us an additional deduction: Either T or U is first. I’m not sure this is that useful though. I tried drawing scenarios with T first or with U first, but there are too many branches.
(I did deduce that if T is first, U comes after S. And if U is first, then T is after S. But, I don’t think this solves any questions. The way I deduced that is simple: none of S, R, Q or P can be after S. So, only T and U are eligible.)
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