None of the above. Aliens exist for sure. An awful lot of them. But they are too far away to ever make contact with. People always underestimate the size of the universe. Even FTL travel wouldn't get you very far in a lifetime.
@FeetAreFantastic I agree with this. With the universe expanding and accelerating, there are likely things so far out of our local zone, there's no way even with 1000 years of advancement we'd ever reach it.