The correct answer to this open question is the following.
Although there were no options, we can say the following.
The distinction between reliability and validity is not always easy. To better distinguish between the two notions, we now tend to view them as aspects of a single broader concept called generalizability.
When we are talking about research and investigation terms, we consider the term "generalizability" when we refer to the extension of the results found in research that also include the conclusions of the study. If there is a large population included in the study, there is a better opportunity to sue generalizability. Then, the terms reliability and validity could be more clear. One, to rely on the results found, and the other to give them certainty through proper numbers.
