Space exploration necessitates a technological industrial civilization. So they/we would somehow have to figure out how to first do #2 (so as to not die), while still maintaining the industrial capacity to spread out into space. That sounds like an even more improbable subset of the already improbable scenario #2.
3rd option: they want to explore
3rd Plus: Facehuggers in the cargo bay.
Space exploration necessitates a technological industrial civilization. So they/we would somehow have to figure out how to first do #2 (so as to not die), while still maintaining the industrial capacity to spread out into space. That sounds like an even more improbable subset of the already improbable scenario #2.