What happens as a result of the kinetic energy of the particles is a liquid being comparable with the inter molecular attractions between the particles?

1 the particles do not move enough to change positions so the liquid is not compressible
2 the particles move enough that they separate from one another and take the shape of the container
3 the particles do not move enough so they are fixed in place and the liquid has a fixed volume
4 the particles move enough that that are not fixed in place and the liquid can flow