Which Is True of Narrative Review? Select All That Apply

Which is true of narrative review? Select all that apply.

A) It may have a stated or implied purpose but does not have hypotheses.
B) It may be selective in including primary studies; it rarely reports specific criteria for including studies.
C) It is useful for obtaining a quick snapshot of the literature or, when done by an expert, providing a specific point of view on a topic.
D) It is an extension of the systematic review and permits the authors, or other researchers, to do a quantitative assessment of the results.