I would say the correct answer is that has an undetermined answer.If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
When formulating a research question, a researcher should write a question that<u> has an undetermined answer</u>.
Explanation:
In other words, there should be a reason for doing your research. You do not know the answer to your question, that is why you need to research the answer. Of course, your research question should be able to be answered, but it shouldn't be so easy to answer that research is not even necessary.
