I'd say it is none of the above. It is another possibility for how life arose on earth. It is interesting as an idea in it's own right but it's going to be tough to find any evidence in the short term. (ignoring what's on Mars as of now).
It would be ID if someone said that intelligence brought life to earth. It would be creationist is someone said that God created life elsewhere (the garden of Eden is on another planet? ). Otherwise it is just an idea.
Common sense isn't