The purpose of the Morley-Michelson experiment was to detect the motion of the lab relatively to the inertial system of the luminiferous aether, i.e. the "aether wind". The theory that the electromagnetic waves were waves of a composite medium – analogously to sound's being made of waves in the air – predicted that the speed of light should change to $c-v$ and $c+v$ if we move relatively to the preferred frame by the speed $v$ (in the direction of light or against it, respectively).
So none of your entries 1,2 in the first list describe the situation correctly. The intent was exactly the opposite (not that it matters too much). The conclusion is 1 in the second list of yours, aether indeed doesn't exist (or doesn't pick a preferred frame) and the electromagnetic waves are waves that don't require any medium and that violate the rules for the additional of velocities (the speed of light is always $c$, not $c\pm v$, regardless of the speed of the source or the detector), except that you should erase "indeed" because no one had expected that result, not even Einstein who was 8 at that time in 1887.
The MM experiment may be viewed as the primary experimental support for special relativity. However, it's also another historical fact that it hasn't played a key role for Einstein while developing special relativity – Einstein's reasoning was entirely theoretical, he didn't refer to the MM experiment, and the only historical evidence that he was actually aware of it was Einstein's reference to a paper by Lorentz that did mention the MM experiment.