Can't answer your question, but agnosticism is usually seperated in types called "strong" (can't know), "weak" (unknown right know, but that might change), and "apathetic" (can't/don't know and don't care).
There is no 'the answer'... or we don't know 'the answer'... or we don't know if there is a 'the answer'... or we don't know if we can know the 'the answer'? 4 kinds of agnosticism, all different.
Your first one sounds more similar to atheism, rather than agnosticism, since it is an active denial of an answer/god. The other 3 to me look like slight variations of weak agnosticism, basically that we don't know right now, but if other facts present themselves we'd adjust our opinion.