Implications from the research on the learner$$s need to know by scholars such as Tannenbaum and colleague, Hicks and Klimoski, Clark et al$.$ and Reber and Wallin should not be generalized about all adult learning because $\_\_\_\_\_.$

All learners are different. It is unrealistic to make generalizations.

The research focus is limited$.$ The studies all focus on learning in organizational trainings.

The studies focus on learning in a variety of settings

None of the above. The results of these studies are sound and transferable.