The main statement names X before Y and makes clear only one computer exists for the two of them to share.
Following that same order, if X took the sole computer, Y could not also have taken it at the same time, so 'X took the computer' leading to 'Y did not take the computer' fits both the wording and the logic of the main statement.
The remaining pairs either contradict themselves outright, X took it implying X did not, or the reverse, or start from Y's action instead of following the main statement's own X-then-Y order.
Therefore, the correct answer is 1, 2.
There are only two ways the room's situation can actually play out: either X ends up with the computer and Y does not, or Y ends up with it and X does not. Let's check each option against these two possible outcomes:
Between the two outcomes that genuinely fit the room's situation, the one matching how the main statement itself lists X and Y is X taking the computer, which rules Y out.
Therefore, the correct answer is 1, 2.