Truth table problem

On this truth table, wouldn’t (xy)’ and x’ + y’ both be correct answers since DeMorgan’s law says that the two equations are interchangeable? It said that (xy)’ was incorrect, but the math works out. Or am I doing something wrong?

I believe they are both correct. But I think that a/A wants the answer to be in the sum-of-products form.

Hey there, I’m thinking it’s xy, since technically x’ (not x=y) and y’ (not y=x) is the same as saying x and y. They’re asking for the simplified version and xy is simplified to it’s “lowest” term, while as soon as you add the ’ notation, it is no longer simplified.